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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
quant-ph/9911085 | Sergio de Filippo | Sergio De Filippo | Withdrawn paper | Only craziness I am ashamed about | null | null | null | quant-ph nucl-th | null | Only craziness I am ashamed about.
| [
{
"version": "v1",
"created": "Thu, 18 Nov 1999 22:36:18 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Nov 1999 21:27:00 GMT"
},
{
"version": "v3",
"created": "Fri, 3 Dec 1999 21:44:44 GMT"
},
{
"version": "v4",
"created": "Sun, 19 Dec 1999 16:49:26 GMT"
},
{
"version": "v5",
"created": "Mon, 26 Sep 2011 16:42:06 GMT"
}
] | 2011-09-27T00:00:00 | [
[
"De Filippo",
"Sergio",
""
]
] |
quant-ph/9911086 | Anthony Chefles | Anthony Chefles | Deterministic Quantum State Transformations | Minor cosmetic changes | null | 10.1016/S0375-9601(00)00291-7 | null | quant-ph | null | We derive a necessary condition for the existence of a completely-positive,
linear, trace-preserving map which deterministically transforms one finite set
of pure quantum states into another. This condition is also sufficient for
linearly-independent initial states. We also examine the issue of quantum
coherence, that is, when such operations maintain the purity of superpositions.
If, in any deterministic transformation from one linearly-independent set to
another, even a single, complete superposition of the initial states maintains
its purity, the initial and final states are related by a unitary
transformation.
| [
{
"version": "v1",
"created": "Fri, 19 Nov 1999 13:39:50 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Dec 1999 17:11:47 GMT"
},
{
"version": "v3",
"created": "Tue, 7 Mar 2000 14:59:15 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Chefles",
"Anthony",
""
]
] |
quant-ph/9911087 | Alexander Shumovsky | Alexander S. Shumovsky and Alexander A. Klyachko | Radiation of a quantum localized source | 4pages | null | null | null | quant-ph | null | New effective operators, describing the photons with given polarization at
given position with respect to a source are proposed. These operators can be
used to construct the near and intermediate zones quantum optics. It is shown
that the use of the conventional plane photons can lead to a wrong results for
quantum fluctuations of polarization even in the far zone.
| [
{
"version": "v1",
"created": "Fri, 19 Nov 1999 15:40:22 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Shumovsky",
"Alexander S.",
""
],
[
"Klyachko",
"Alexander A.",
""
]
] |
quant-ph/9911088 | Inigo L. Egusquiza | A. D. Baute, I. L. Egusquiza, J. G. Muga and R. Sala-Mayato | Time-of-arrival distributions from position-momentum and energy-time
joint measurements | null | Phys. Rev. A 61, 052111 (2000) | 10.1103/PhysRevA.61.052111 | EHU-FT/9913 | quant-ph | null | The position-momentum quasi-distribution obtained from an Arthurs and Kelly
joint measurement model is used to obtain indirectly an ``operational''
time-of-arrival (TOA) distribution following a quantization procedure proposed
by Kocha\'nski and W\'odkiewicz [Phys. Rev. A 60, 2689 (1999)]. This TOA
distribution is not time covariant. The procedure is generalized by using other
phase-space quasi-distributions, and sufficient conditions are provided for
time covariance that limit the possible phase-space quasi-distributions
essentially to the Wigner function, which, however, provides a non-positive TOA
quasi-distribution. These problems are remedied with a different quantization
procedure which, on the other hand, does not guarantee normalization. Finally
an Arthurs and Kelly measurement model for TOA and energy (valid also for
arbitrary conjugate variables when one of the variables is bounded from below)
is worked out. The marginal TOA distribution so obtained, a distorted version
of Kijowski's distribution, is time covariant, positive, and normalized.
| [
{
"version": "v1",
"created": "Fri, 19 Nov 1999 18:47:10 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Baute",
"A. D.",
""
],
[
"Egusquiza",
"I. L.",
""
],
[
"Muga",
"J. G.",
""
],
[
"Sala-Mayato",
"R.",
""
]
] |
quant-ph/9911089 | Mikhail Sergeenko | M.N. Sergeenko | Quantum fluctuations of the angular momentum and energy of the ground
state | 5 pages, LaTex | Modern Physics Letters A Vol. 13, No. 01, pp. 33-37 (1998) | 10.1142/S0217732398000061 | null | quant-ph | null | Quasiclassical solution of the three-dimensional Schredinger's equation is
given. The existence of nonzero minimal angular momentum M_0 = \hbar /2 is
shown, which corresponds to the quantum fluctuations of the angular momentum
and contributes to the energy of the ground state.
| [
{
"version": "v1",
"created": "Fri, 19 Nov 1999 18:22:47 GMT"
}
] | 2016-02-17T00:00:00 | [
[
"Sergeenko",
"M. N.",
""
]
] |
quant-ph/9911090 | Dr. Arun Kumar Pati | Arun Kumar Pati and Samuel L. Braunstein | Impossibility of deleting an unknown quantum state | 4 Pages, (Published version Nature, 404 (2000) 164) | Nature, 404: 164 (2000) | 10.1038/35004532 | null | quant-ph | null | A photon in an arbitrary polarization state cannot be cloned perfectly. But
suppose that at our disposal we have several copies of an unknown photon. Is it
possible to delete the information content of one or more of these photons by a
physical process? Specifically, if two photons are in the same initial
polarization state is there a mechanism that produces one photon in the same
initial state and the other in some standard polarization state. If this can be
done, then one would create a standard blank state onto which one could copy an
unknown state approximately, by deterministic cloning or exactly, by
probabilistic cloning. This might be useful in quantum computation, where one
could store some new information in an already computed state by deleting the
old information. Here we show that the linearity of quantum theory does not
allow us to delete a copy of an arbitrary quantum state perfectly. Though in a
classical computer information can be deleted against a copy, the same task
cannot be accomplished with quantum information.
| [
{
"version": "v1",
"created": "Fri, 19 Nov 1999 19:55:36 GMT"
},
{
"version": "v2",
"created": "Mon, 31 Jul 2000 18:01:40 GMT"
}
] | 2017-05-10T00:00:00 | [
[
"Pati",
"Arun Kumar",
""
],
[
"Braunstein",
"Samuel L.",
""
]
] |
quant-ph/9911091 | Josephine Bolosan | S. Pakvasa, W. Simmons and X. Tata | Relativistic Quantum Computing | 8 pages, Latex format, no figures | null | null | UH-511-946-99 | quant-ph | null | We present some informal remarks on aspects of relativistic quantum
computing.
| [
{
"version": "v1",
"created": "Fri, 19 Nov 1999 23:20:41 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Pakvasa",
"S.",
""
],
[
"Simmons",
"W.",
""
],
[
"Tata",
"X.",
""
]
] |
quant-ph/9911092 | Ilki Kim | Ilki Kim, Guenter Mahler | Quantum chaos in small quantum networks | Accepted for publication in JMO (quantum information special issue,
Vol 47), 3 figures | null | 10.1080/09500340008244035 | null | quant-ph | null | We study a 2-spin quantum Turing architecture, in which discrete local
rotations \alpha_m of the Turing head spin alternate with quantum controlled
NOT-operations. We show that a single chaotic parameter input \alpha_m leads to
a chaotic dynamics in the entire Hilbert space. The instability of periodic
orbits on the Turing head and `chaos swapping' onto the Turing tape are
demonstrated explicitly as well as exponential parameter sensitivity of the
Bures metric.
| [
{
"version": "v1",
"created": "Sat, 20 Nov 1999 03:50:02 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Kim",
"Ilki",
""
],
[
"Mahler",
"Guenter",
""
]
] |
quant-ph/9911093 | Michael Martin Nieto | Michael Martin Nieto and D. Rodney Truax | Schr\"odinger equations with time-dependent P^2 and X^2 terms | LaTeX, 21 pages including one table. Minor changes noted and
suggested by the referee | null | null | LA-UR-99-219 | quant-ph | null | We present some general results for the time-dependent mass Hamiltonian
problem with H=-{1/2}e^{-2\nu}\partial_{xx} +h^{(2)}(t)e^{2\nu}x^2. This
Hamiltonian corresponds to a time-dependent mass (TM) Schr\"odinger equation
with the restriction that there are only P^2 and X^2 terms. We give the
specific transformations to a different quantum Schr\"odinger(TQ) equation and
to a different time-dependent oscillator (TO) equation. For each Schr\"odinger
system, we give the Lie algebra of space-time symmetries and (x,t)
representations for number states, coherent states, and squeezed states. These
general results include earlier work as special cases.
| [
{
"version": "v1",
"created": "Sat, 20 Nov 1999 04:07:05 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Feb 2000 03:38:50 GMT"
},
{
"version": "v3",
"created": "Mon, 21 Jan 2002 04:32:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Nieto",
"Michael Martin",
""
],
[
"Truax",
"D. Rodney",
""
]
] |
quant-ph/9911094 | Michael Martin Nieto | Michael Martin Nieto and D. Rodney Truax | The Schr\"odinger system H=-{1/2}e^{\Upsilon(t-t_o)}\partial_{xx}
+\lfrac{1}{2}\omega^2e^{-\Upsilon(t-t_o)}x^2 | Latex, 24 pages, including 3 figures and 8 tables. New title and
format for journal. Conclusion added | Ann. Phys. 292 (2001) 1 | 10.1006/aphy.2001.6144 | LA-UR-99-482 | quant-ph | null | In this paper, we attack the specific time-dependent Hamiltonian problem
H=-{1/2}e^{\Upsilon(t-t_o)}\partial_{xx}
+\lfrac{1}{2}\omega^2e^{-\Upsilon(t-t_o)}x^2. This corresponds to a
time-dependent mass (TM) Schr\"odinger equation. We give the specific
transformations to i) the more general quadratic (TQ) Schr\"odinger equation
and to ii) a different time-dependent oscillator (TO) equation. For each
Schr\"odinger system, we give the Lie algebra of space-time symmetries, the
number states, the coherent states, the squeezed-states and the time-dependent
<x>, <p>, (\Delta x)^2, (\Delta p)^2, and uncertainty product.
| [
{
"version": "v1",
"created": "Sat, 20 Nov 1999 04:24:51 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Feb 2000 04:04:08 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Nieto",
"Michael Martin",
""
],
[
"Truax",
"D. Rodney",
""
]
] |
quant-ph/9911095 | Michael Martin Nieto | Michael Martin Nieto and D. Rodney Truax | The Schr\"odinger system H=-{1/2} (t_o/t)^a \partial_{xx} + (1/2)
\omega^2 (t/t_o)^b x^2 | LaTeX, 26 pages, including 3 figures and 13 tables. New title and
format for journal. Conclusion added | Ann. Phys. 292 (2001) 23 | 10.1006/aphy.2001.6145 | LA-UR-99-3835 | quant-ph | null | We attack the specific time-dependent Hamiltonian problem H=-{1/2} (t_o/t)^a
\partial_{xx} + (1/2) \omega^2 (t/t_o)^b x^2. This corresponds to a
time-dependent mass (TM) Schr\"odinger equation. We give the specific
transformations to a different time-dependent quadratic Schr\"odinger equations
(TQ) and to a different time-dependent oscillator (TO) equation. For each
Schr\"odinger system, we give the Lie algebra of space-time symmetries, the
number states, the squeezed-state <x> and <p> (with their classical motion),
(\Delta x)^2, (\Delta p)^2, and the uncertainty product.
| [
{
"version": "v1",
"created": "Sat, 20 Nov 1999 04:41:30 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Feb 2000 04:21:51 GMT"
},
{
"version": "v3",
"created": "Mon, 21 Jan 2002 17:39:38 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Nieto",
"Michael Martin",
""
],
[
"Truax",
"D. Rodney",
""
]
] |
quant-ph/9911096 | Tuck Choy | T.C. Choy | The Van der Waals interaction of the hydrogen molecule - an exact local
energy density functional | 11 pages, 13 figures and 28 references | Physical Review A vol 62 12506 (2000) | 10.1103/PhysRevA.62.012506 | null | quant-ph cond-mat.str-el physics.atm-clus physics.chem-ph | null | We verify that the van der Waals interaction and hence all dispersion
interactions for the hydrogen molecule given by: W"= -{A/R^6}-{B/R^8}-{C/R^10}-
..., in which R is the internuclear separation, are exactly soluble. The
constants A=6.4990267..., B=124.3990835 ... and C=1135.2140398... (in Hartree
units) first obtained approximately by Pauling and Beach (PB) [1] using a
linear variational method, can be shown to be obtainable to any desired
accuracy via our exact solution. In addition we shall show that a local energy
density functional can be obtained, whose variational solution rederives the
exact solution for this problem. This demonstrates explicitly that a static
local density functional theory exists for this system. We conclude with
remarks about generalising the method to other hydrogenic systems and also to
helium.
| [
{
"version": "v1",
"created": "Mon, 22 Nov 1999 08:42:00 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Nov 1999 03:40:46 GMT"
}
] | 2011-08-05T00:00:00 | [
[
"Choy",
"T. C.",
""
]
] |
quant-ph/9911097 | A. K. Rajagopal | Sumiyoshi Abe (1) and A. K. Rajagopal (2) ((1)College of Science and
Technology, Nihon University, Funabashi, Chiba, Japan, (2)Naval Research
Laboratory, Washington, D.C.) | Nonuniqueness of Canonical Ensemble Theory arising from Microcanonical
Basis | 13 pages; This is a thoroughly revised version of the original
preprint which has now appearted in print. It also corrects several errors
and misstatements in the published version. The main conclusions of the paper
however remain intact | Phys. Lett. A272, 341 (2000) | 10.1016/S0375-9601(00)00458-8 | null | quant-ph cond-mat.stat-mech | null | Given physical systems, counting rule for their statistical mechanical
descriptions need not be unique, in general. It is shown that this
nonuniqueness leads to the existence of various canonical ensemble theories
which equally arise from the definite microcanonical basis. Thus, the Gibbs
theorem for canonical ensemble theory is not universal, and the maximum entropy
principle is to be appropriately modefied for each physical context.
| [
{
"version": "v1",
"created": "Mon, 22 Nov 1999 12:46:26 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Oct 2000 17:04:22 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Abe",
"Sumiyoshi",
""
],
[
"Rajagopal",
"A. K.",
""
]
] |
quant-ph/9911098 | Aurel Bulgac | Aurel Bulgac, Giu Do Dand and Dimitri Kusnezov | Dynamics of Complex Quantum Systems: Dissipation and Kinetic Equations | 7 pages, Elsevier style file espcrc2.sty | Physica E9 (2001) 429-435 | 10.1016/S1386-9477(00)00240-X | null | quant-ph cond-mat.stat-mech nucl-th | null | We present a microscopic approach to quantum dissipation and sketch the
derivation of the kinetic equation describing the evolution of a simple quantum
system in interaction with a complex quantum system. A typical quantum complex
system is modeled by means of parametric banded random matrices coupled to the
subsystem of interest. We do not assume the weak coupling limit and allow for
an independent dynamics of the ``reservoir''. We discuss the reasons for having
a new theoretical approach and the new elements introduced by us. The present
approach incorporates known limits and previous results, but at the same time
includes new cases, previously never derived on a microscopic level. We briefly
discuss the kinetic equation and its solution for a particle in the absence of
an external field.
| [
{
"version": "v1",
"created": "Tue, 23 Nov 1999 00:22:43 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Bulgac",
"Aurel",
""
],
[
"Dand",
"Giu Do",
""
],
[
"Kusnezov",
"Dimitri",
""
]
] |
quant-ph/9911099 | Alex Moroz | Alexander Moroz | A remark on the isotropic model | 3 pages, plain latex. $\eta$ in the LDOS asymptotics near a band-edge
is universal in one dimension. For more info on this subject see
http://www.amolf.nl/research/photonic_materials_theory/moroz/moroz.html | null | null | null | quant-ph | null | The applicability of the so-called isotropic and anisotropic complete
photonic-band-gap (CPBG) models [S. John and J. Wang, Phys. Rev. Lett. {\bf
64}, 2418 (1990)] to capture essential features of the spontaneous emission
(SE) of a fluorescent atom or molecule near a band-gap-edge of a CPBG structure
is discussed.
| [
{
"version": "v1",
"created": "Tue, 23 Nov 1999 17:05:38 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Feb 2000 15:01:33 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Moroz",
"Alexander",
""
]
] |
quant-ph/9911100 | David Vitali | R. Bonifacio, S. Olivares, P. Tombesi, and D. Vitali | A model independent approach to non dissipative decoherence | 12 pages, 3 figures | Phys. Rev. A 61 053802 (2000) | 10.1103/PhysRevA.61.053802 | null | quant-ph | null | We consider the case when decoherence is due to the fluctuations of some
classical variable or parameter of a system and not to its entanglement with
the environment. Under few and quite general assumptions, we derive a
model-independent formalism for this non-dissipative decoherence, and we apply
it to explain the decoherence observed in some recent experiments in cavity QED
and on trapped ions.
| [
{
"version": "v1",
"created": "Tue, 23 Nov 1999 17:38:11 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Nov 1999 12:26:28 GMT"
},
{
"version": "v3",
"created": "Fri, 14 Jan 2000 15:14:28 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Bonifacio",
"R.",
""
],
[
"Olivares",
"S.",
""
],
[
"Tombesi",
"P.",
""
],
[
"Vitali",
"D.",
""
]
] |
quant-ph/9911101 | Chi-Keung Chow | Chi-Keung Chow and Thomas D. Cohen | Quantum Coins, Dice and Children: Probability and Quantum Statistics | 8 pages in REVTeX | Am.J.Phys. 68 (2000) 829-834 | 10.1119/1.1302821 | DOE/ER/40762-187, UMD PP#00-003 | quant-ph cond-mat.stat-mech hep-ph nucl-th physics.ed-ph | null | We discuss counterintuitive aspects of probabilities for systems of identical
particles obeying quantum statistics. Quantum coins and children (two level
systems) and quantum dice (many level systems) are used as examples. It is
emphasized that, even in the absence of interactions, (anti)symmetrizations of
multi-particle wavefunctions destroy statistical independences and often lead
to dramatic departures from our intuitive expectations.
| [
{
"version": "v1",
"created": "Tue, 23 Nov 1999 23:11:25 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Feb 2000 17:18:28 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Chow",
"Chi-Keung",
""
],
[
"Cohen",
"Thomas D.",
""
]
] |
quant-ph/9911102 | Akira Shimizu | Akira Shimizu | A Fundamental Limit of Measurement Imposed by the Elementary
Interactions | 10 pages including 1 figure. Proc. 3rd Tohwa Univ. Int. Conf.
Statistical Physics (Fukuoka, Japan, 1999) to be published from AIP | Statistical Physics (ed. M. Tokuyama and H.E. Stanley, AIP 2000)
pp. 611-620. | 10.1063/1.1291630 | null | quant-ph chao-dyn cond-mat.stat-mech nlin.CD | null | Quantum information theory is closely related to quantum measurement theory
because one must perform measurement to obtain information on a quantum system.
Among many possible limits of quantum measurement, the simplest ones were
derived directly from the uncertainty principles. However, such simple limits
are not the only limits. I here suggest a new limit which comes from the forms
and the strengths of the elementary interactions. Namely, there are only four
types of elementary interactions in nature; their forms are determined by the
gauge invariance (and symmetry breaking), and their coupling constants (in the
low-energy regime) have definite values. I point out that this leads to a new
fundamental limit of quantum measurements. Furthermore, this fundamental limit
imposes the fundamental limits of getting information on, preparing, and
controlling quantum systems.
| [
{
"version": "v1",
"created": "Wed, 24 Nov 1999 06:00:24 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Shimizu",
"Akira",
""
]
] |
quant-ph/9911103 | Piotr Deuar | P. Deuar and W. J. Munro | Improving Detectors Using Entangling Quantum Copiers | 4 pages, 2 figures, REVTeX, to be published in Phys. Rev. A | Phys. Rev A. 61, 10306R, (1999) | 10.1103/PhysRevA.61.010306 | null | quant-ph | null | We present a detection scheme which using imperfect detectors, and imperfect
quantum copying machines (which entangle the copies), allows one to extract
more information from an incoming signal, than with the imperfect detectors
alone.
| [
{
"version": "v1",
"created": "Wed, 24 Nov 1999 06:29:35 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Deuar",
"P.",
""
],
[
"Munro",
"W. J.",
""
]
] |
quant-ph/9911104 | Rajkumar Roychoudhury | B.Bagchi and R.Roychoudhury | A new PT symmetric complex Hamiltonian with a real spectra | null | null | 10.1088/0305-4470/33/1/101 | null | quant-ph | null | We construct an isospectrum systems in terms of a real and complex potential
to show that the underlying PT symmetric Hamiltonian possesses a real spectrum
which is shared by its real partner.
| [
{
"version": "v1",
"created": "Wed, 24 Nov 1999 07:26:08 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Bagchi",
"B.",
""
],
[
"Roychoudhury",
"R.",
""
]
] |
quant-ph/9911105 | Mayburov S. N. | S.Mayburov (Lebedev Inst. of Physics, Moscow, Russia) | Quantum Information, Irreversibility and State Collapse in Some
Microscopic Models of Measurement | 15 pages, Latex, Talk given at 'Decoherence and entanglement'
Conference, Garda, Italy, September 1999, to appear in Proceedings | null | null | null | quant-ph | null | The quantum measurement problem considered for measuring system (MS) model
which consist of measured state S (particle), detector D and information
processing device O. For spin chains and other O models the state evolution for
MS observables measurements studied. It's shown that specific O states
structure forbids the measurement of MS interference terms which discriminate
pure and mixed S states. It results in the reduction MS Hilbert space to O
representation in which MS evolution is irreversible, which in operational
formalism corresponds to S state collapse. In radiation decoherence O model
Glauber restrictions on QED field observables results in analogous irreversible
MS + field evolution. The results interpretation in Quantum Information
framework and Rovelli Relational Quantum Mechanics discussed.
| [
{
"version": "v1",
"created": "Wed, 24 Nov 1999 15:42:55 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Mayburov",
"S.",
"",
"Lebedev Inst. of Physics, Moscow, Russia"
]
] |
quant-ph/9911106 | Abel Camacho Quintana | Abel Camacho (Astrophysikalishes Institut Potsdam) | Quantum nondemolition measurements of a particle in an inhomogeneous
gravitational field | Contribution in honour of Heinz Dehnen's 65 birthday. 3 new
references, minor changes. Accepted in General Relativity and Gravitation | Gen.Rel.Grav. 33 (2001) 901-911 | 10.1023/A:1010264009752 | null | quant-ph gr-qc | null | In this work we obtain a family of quantum nondemolition variables for the
case of a particle moving in an inhomogeneous gravitational field. Afterwards,
we calculate the corresponding propagator, and deduce the probabilitites
associated with the possible measurements outputs. The comparison, with the
case in which the position is being monitored, will allow us to find the
differences with respect to the case of a quantum demolition measuring process.
| [
{
"version": "v1",
"created": "Thu, 25 Nov 1999 13:03:16 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Jun 2000 13:42:34 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Camacho",
"Abel",
"",
"Astrophysikalishes Institut Potsdam"
]
] |
quant-ph/9911107 | Andrei Kirilyuk | Andrei P. Kirilyuk | 75 Years of Matter Wave: Louis de Broglie and Renaissance of the
Causally Complete Knowledge | 28 pages, 25 eqs, 47 refs; Dedicated to the 75th Anniversary of
matter wave appearance in the Ph.D. thesis defended by Louis de Broglie in
Paris 25 November 1924; Reviews a part of the author's book "Universal
Concept of Complexity by the Dynamic Redundance Paradigm: Causal Randomness,
Complete Wave Mechanics, and the Ultimate Unification of Knowledge" (Kyiv,
Naukova Dumka, 1997 ; in English), see physics/9806002; new text format,
stylistic corrections in v2 | null | null | null | quant-ph physics.hist-ph | null | A physically real wave associated with any moving particle and travelling in
a surrounding material medium was introduced by Louis de Broglie in a series of
short notes in 1923 and in a more complete form in his thesis defended in Paris
on the 25th November 1924. This result, recognised by the Nobel Prize in 1929,
gave rise to a major direction of "new physics" known today as "quantum
mechanics". However, although such notions as "de Broglie wavelength" and
"wave-particle duality" form the basis of the standard quantum theory, it
actually only takes for granted (postulates) the formula for the particle
wavelength and totally ignores the underlying causal, realistic and physically
transparent picture of wave-particle dynamics outlined by Louis de Broglie in
his thesis and further considerably developed in his later works, in the form
of "double solution" and "hidden thermodynamics" theory. A price to pay for
such rough deviation from the original de Broglian realism and consistency
involves fundamental physics domination by purely abstract and mechanistically
simplified schemes of formal symbols and rules that have led to a deep
knowledge impasse justly described as "the end of science". However, a new,
independent approach of "quantum field mechanics" (quant-ph/9902015,
quant-ph/9902016, physics/0401164) created within the "universal science of
complexity" (physics/9806002) provides many-sided confirmation and natural
completion of de Broglie's "nonlinear wave mechanics", eliminating all its
"difficult points" and reconstituting the causally complete, totally consistent
and intrinsically unified picture of the real, complex micro-world dynamics
directly extendible to all higher levels of unreduced world complexity.
| [
{
"version": "v1",
"created": "Thu, 25 Nov 1999 14:32:15 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Nov 2004 19:42:43 GMT"
}
] | 2009-09-25T00:00:00 | [
[
"Kirilyuk",
"Andrei P.",
""
]
] |
quant-ph/9911108 | null | Victor Novozhilov and Yuri Novozhilov (St.Petersburg State University) | Collective variables and composite fields | 12 pages, Latex, to be published in the Proceedings of the Conference
"Probability and Irreversibility in Quantum Mechanics", 5-9 July 1999,
Fondation des Treilles, France | null | null | null | quant-ph | null | We consider use of collective variables for description of composite fields
as collective phenomena due to the strong coupling regime. We discuss two
approaches, where identification of collective variables of complex quantum
system does not depend on knowledge of other degrees of freedom: (a) collective
variables as parameters of group transformations changing the path integral of
the system, and (b) collective variables as background fields for quantum
system. In the case (a) we briefly present an approach. In the case (b) we
consider fermions in an external scalar field, which serves as a collective
variable in a nonlinear model for composite scalar field with a finite
compositeness scale.
| [
{
"version": "v1",
"created": "Thu, 25 Nov 1999 16:49:31 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Novozhilov",
"Victor",
"",
"St.Petersburg State University"
],
[
"Novozhilov",
"Yuri",
"",
"St.Petersburg State University"
]
] |
quant-ph/9911109 | Wolfgang Tittel | W. Tittel, J. Brendel, H. Zbinden, and N. Gisin | Quantum Cryptography using entangled photons in energy-time Bell states | 4 pages including 2 figures | null | 10.1103/PhysRevLett.84.4737 | null | quant-ph | null | We present a setup for quantum cryptography based on photon pairs in
energy-time Bell states and show its feasability in a laboratory experiment.
Our scheme combines the advantages of using photon pairs instead of faint laser
pulses and the possibility to preserve energy-time entanglement over long
distances. Moreover, using 4-dimensional energy-time states, no fast random
change of bases is required in our setup : Nature itself decides whether to
measure in the energy or in the time base.
| [
{
"version": "v1",
"created": "Thu, 25 Nov 1999 18:05:00 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Tittel",
"W.",
""
],
[
"Brendel",
"J.",
""
],
[
"Zbinden",
"H.",
""
],
[
"Gisin",
"N.",
""
]
] |
quant-ph/9911110 | Valeri Dvoeglazov | Valeri V. Dvoeglazov (Zacatecas University) | Comment on the "Maxwell Equations as the One-Photon Quantum Equation" by
A. Gersten [Found. Phys. Lett. 12, pp. 291-298 (1999)] | ReVTeX style. 10pp., see quant-ph/9911049 | J. Phys. A: Math. Gen. 33 (2000) 5011-5016 (revised version) | 10.1088/0305-4470/33/28/305 | EFUAZ FT-99-78 | quant-ph | null | We show that the Gersten derivation of Maxwell equations can be generalized.
It actually leads to additional solutions of `S=1 equations'. They follow
directly from previous considerations by Majorana, Oppenheimer, Weinberg and
Ogievetskii and Polubarinov. Therefore, {\it generalized} Maxwell equations
should be used as a guideline for proper interpretations of quantum theories.
| [
{
"version": "v1",
"created": "Fri, 26 Nov 1999 02:39:06 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Dvoeglazov",
"Valeri V.",
"",
"Zacatecas University"
]
] |
quant-ph/9911111 | Giovanna Morigi | G. Morigi, G.S. Agarwal | Temperature Variation of Ultra Slow Light in a Cold Gas | 12 pages, 4 figures | Phys. Rev. A 62, 013801 (2000) | 10.1103/PhysRevA.62.013801 | null | quant-ph | null | A model is developed to explain the temperature dependence of the group
velocity as observed in the experiments of Hau et al (Nature {\bf397}, 594
(1999)). The group velocity is quite sensitive to the change in the spatial
density. The inhomogeneity in the density and its temperature dependence are
primarily responsible for the observed behavior.
| [
{
"version": "v1",
"created": "Fri, 26 Nov 1999 09:21:23 GMT"
}
] | 2010-03-30T00:00:00 | [
[
"Morigi",
"G.",
""
],
[
"Agarwal",
"G. S.",
""
]
] |
quant-ph/9911112 | Igor Bargatin | I. V. Bargatin, B. A. Grishanin, and V. N. Zadkov | Analysis of radiatively stable entanglement in a system of two
dipole-interacting three-level atoms | Replaced with the final version; 14 pages, 6 figures; to appear in
Phys. Rev. A, vol. 61 (2000) | null | 10.1103/PhysRevA.61.052305 | null | quant-ph | null | We explore the possibilities of creating radiatively stable entangled states
of two three-level dipole-interacting atoms in a $\Lambda$ configuration by
means of laser biharmonic continuous driving or pulses. We propose three
schemes for generation of entangled states which involve only the lower states
of the $\Lambda$ system, not vulnerable to radiative decay. Two of them employ
coherent dynamics to achieve entanglement in the system, whereas the third one
uses optical pumping, i.e., an essentially incoherent process.
| [
{
"version": "v1",
"created": "Fri, 26 Nov 1999 13:58:11 GMT"
},
{
"version": "v2",
"created": "Sun, 28 Nov 1999 12:58:58 GMT"
},
{
"version": "v3",
"created": "Thu, 16 Mar 2000 10:54:03 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Bargatin",
"I. V.",
""
],
[
"Grishanin",
"B. A.",
""
],
[
"Zadkov",
"V. N.",
""
]
] |
quant-ph/9911113 | Arkadiusz Jadczyk | Ph. Blanchard, A. Jadczyk, A. Ruschhaupt | How Events Come Into Being: EEQT, Particle Tracks, Quantum Chaos, and
Tunneling Time | latex, 27 pages, 7 postscript figures. Paper submitted to Proc.
Conference "Mysteries, Puzzles And Paradoxes In Quantum Mechanics, Workshop
on Entanglement And Decoherence, Palazzo Feltrinelli, Gargnano, Garda Lake,
Italy, 20-25 September, 1999 | in "Mysteries, Puzzles and Paradoxes in Quantum Mechanics",
Rodolfo Bonifacio, Ed., Woodbury, NY: American Institute of Physics, 1999,
[AIP Conference Proceedings, no. 461], J. Mod. Opt. 47 (2000), 2247-2263 | 10.1080/09500340008235146 | null | quant-ph chao-dyn nlin.CD | null | In sections 1 and 2 we review Event Enhanced Quantum Theory (EEQT). In
section 3 we discuss applications of EEQT to tunneling time, and compare its
quantitative predictions with other approaches, in particular with
B\"uttiker-Larmor and Bohm trajectory approach. In section 4 we discuss quantum
chaos and quantum fractals resulting from simultaneous continuous monitoring of
several non-commuting observables. In particular we show self-similar,
non-linear, iterated function system-type, patterns arising from quantum jumps
and from the associated Markov operator. Concluding remarks pointing to
possible future development of EEQT are given in section 5.
| [
{
"version": "v1",
"created": "Fri, 26 Nov 1999 19:43:55 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Blanchard",
"Ph.",
""
],
[
"Jadczyk",
"A.",
""
],
[
"Ruschhaupt",
"A.",
""
]
] |
quant-ph/9911114 | Xiao-Guang Wang | Xiao-Guang Wang | Ladder operator formalisms and generally deformed oscillator algebraic
structures of quantum states in Fock space | 19 pages, no figures | J.Opt.BQuant.Semiclass.Opt.2:534-540,2000 | 10.1088/1464-4266/2/4/312 | null | quant-ph | null | We show that various kinds of one-photon quantum states studied in the field
of quantum optics admit ladder operator formalisms and have the generally
deformed oscillator algebraic structure. The two-photon case is also
considered. We obtain the ladder operator formalisms of two general states
defined in the even/odd Fock space. The two-photon states may also have a
generally deformed oscillator algebraic structure. Some interesting examples of
one-photon and two-photon quantum states are given.
| [
{
"version": "v1",
"created": "Mon, 29 Nov 1999 02:16:39 GMT"
},
{
"version": "v2",
"created": "Sun, 30 Apr 2000 13:54:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wang",
"Xiao-Guang",
""
]
] |
quant-ph/9911115 | Bassano Vacchini | L. Lanz, B. Vacchini | Time scales in quantum mechanics by a scattering map | 10 pages, latex, no figures | Int.J.Theor.Phys. 37 (1998) 545-553 | null | null | quant-ph | null | Inside quantum mechanics the problem of decoherence for an isolated, finite
system is linked to a coarse-grained description of its dynamics.
| [
{
"version": "v1",
"created": "Mon, 29 Nov 1999 14:10:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lanz",
"L.",
""
],
[
"Vacchini",
"B.",
""
]
] |
quant-ph/9911116 | Miloslav Znojil | M. Znojil | Shape invariant potentials with PT symmetry | version 1: 5 pages, Latex (already published: J. Phys. A: Math. Gen.
33 (2000) L61-2; version 2: 28 pages of a review-type update prepared as a
text of a proposed seminar (ATOMKI, Debrecen, presumably this week) | J. Phys. A: Math. Gen. 33 (2000) L61-2 | 10.1088/0305-4470/33/7/102 | null | quant-ph | null | Suitable complexification of the well known solvable oscillators in one
dimension is shown to give the four exactly solvable models which combine the
shape- and PT-invariance.
In version v2 the result is extended of the s-wave shape-invariant forces.
| [
{
"version": "v1",
"created": "Mon, 29 Nov 1999 16:01:15 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Mar 2000 08:18:45 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Znojil",
"M.",
""
]
] |
quant-ph/9911117 | Barbara M. Terhal | Barbara M. Terhal and Pawel Horodecki | A Schmidt number for density matrices | 5 pages RevTex, 1 typo in Proof Lemma 1 corrected | Phys. Rev. A Rapid Communications Vol.61,040301 (2000) | 10.1103/PhysRevA.61.040301 | null | quant-ph | null | We introduce the notion of a Schmidt number of a bipartite density matrix,
characterizing the minimum Schmidt rank of the pure states that are needed to
construct the density matrix. We prove that Schmidt number is nonincreasing
under local quantum operations and classical communication. We show that
$k$-positive maps witness Schmidt number, in the same way that positive maps
witness entanglement. We show that the family of states which is made from
mixing the completely mixed state and a maximally entangled state have
increasing Schmidt number depending on the amount of maximally entangled state
that is mixed in. We show that Schmidt number {\it does not necessarily
increase} when taking tensor copies of a density matrix $\rho$; we give an
example of a density matrix for which the Schmidt numbers of $\rho$ and $\rho
\otimes \rho$ are both 2.
| [
{
"version": "v1",
"created": "Mon, 29 Nov 1999 19:05:47 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Dec 1999 17:03:37 GMT"
},
{
"version": "v3",
"created": "Mon, 13 Dec 1999 20:38:17 GMT"
},
{
"version": "v4",
"created": "Mon, 6 Mar 2000 21:51:05 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Terhal",
"Barbara M.",
""
],
[
"Horodecki",
"Pawel",
""
]
] |
quant-ph/9911118 | Richard L. Hall | Richard L. Hall and Nasser Saad | Variational analysis for a generalized spiked harmonic oscillator | 15 pages, 1 figure | J. Phys. A 33, 569-578 (2000) | 10.1088/0305-4470/33/3/310 | CUQM-76 | quant-ph math-ph math.MP | null | A variational analysis is presented for the generalized spiked harmonic
oscillator Hamiltonian operator H, where H = -(d/dx)^2 + Bx^2+ A/x^2 +
lambda/x^alpha, and alpha and lambda are real positive parameters. The
formalism makes use of a basis provided by exact solutions of Schroedinger's
equation for the Gol'dman and Krivchenkov Hamiltonian (alpha = 2), and the
corresponding matrix elements that were previously found. For all the discrete
eigenvalues the method provides bounds which improve as the dimension of the
basis set is increased. Extension to the N-dimensional case in arbitrary
angular-momentum subspaces is also presented. By minimizing over the free
parameter A, we are able to reduce substantially the number of basis functions
needed for a given accuracy.
| [
{
"version": "v1",
"created": "Mon, 29 Nov 1999 19:16:04 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Hall",
"Richard L.",
""
],
[
"Saad",
"Nasser",
""
]
] |
quant-ph/9911119 | Martin Plenio | S. Virmani and M. B. Plenio | Ordering States with Entanglement Measures | 6 pages, minor changes, references updated, all conclusions
unchanged, now accepted for publication | Physics Letters A 268, 31 (2000) | 10.1016/S0375-9601(00)00157-2 | null | quant-ph | null | We demonstrate that all good asymptotic entanglement measures are either
identical or place a different ordering on the set of all quantum states.
| [
{
"version": "v1",
"created": "Mon, 29 Nov 1999 19:18:25 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Feb 2000 18:29:32 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Virmani",
"S.",
""
],
[
"Plenio",
"M. B.",
""
]
] |
quant-ph/9911120 | MinXin Huang | Minxin Huang, Yongde Zhang, Guang Hou (University of Science and
Technology of China) | Classical Capacity of A Quantum Multiple Access Channel | Latex | Phys. Rev. A, Volume 62, 052106 (2000) | 10.1103/PhysRevA.62.052106 | null | quant-ph | null | We consider the transmission of classical information over a quantum channel
by two senders. The channel capacity region is shown to be a convex hull bound
by the Von Neumann entropy and the conditional Von Neumann entropy. We discuss
some possible applications of our result. We also show that our scheme allows a
reasonable distribution of channel capacity over two senders.
| [
{
"version": "v1",
"created": "Tue, 30 Nov 1999 10:16:36 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Dec 1999 13:20:59 GMT"
},
{
"version": "v3",
"created": "Thu, 9 Dec 1999 07:07:39 GMT"
},
{
"version": "v4",
"created": "Sun, 14 May 2000 03:12:49 GMT"
},
{
"version": "v5",
"created": "Mon, 6 Nov 2000 18:48:51 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Huang",
"Minxin",
"",
"University of Science and\n Technology of China"
],
[
"Zhang",
"Yongde",
"",
"University of Science and\n Technology of China"
],
[
"Hou",
"Guang",
"",
"University of Science and\n Technology of China"
]
] |
quant-ph/9911121 | Ariel Gordon | A. Gordon and J. E. Avron | Born-Oppenheimer Approximation near Level Crossing | 8 pages, 1 figure, Letter | Phys. Rev. Let. 85, 34 (2000) | 10.1103/PhysRevLett.85.34 | null | quant-ph math-ph math.MP physics.chem-ph | null | We consider the Born-Oppenheimer problem near conical intersection in two
dimensions. For energies close to the crossing energy we describe the wave
function near an isotropic crossing and show that it is related to generalized
hypergeometric functions 0F3. This function is to a conical intersection what
the Airy function is to a classical turning point. As an application we
calculate the anomalous Zeeman shift of vibrational levels near a crossing.
| [
{
"version": "v1",
"created": "Tue, 30 Nov 1999 13:37:00 GMT"
},
{
"version": "v2",
"created": "Sun, 27 Feb 2000 11:00:30 GMT"
},
{
"version": "v3",
"created": "Tue, 2 May 2000 10:03:34 GMT"
},
{
"version": "v4",
"created": "Mon, 29 May 2000 07:22:59 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Gordon",
"A.",
""
],
[
"Avron",
"J. E.",
""
]
] |
quant-ph/9911122 | Sergio de Filippo | Sergio De Filippo | Quantum states as generalized classical ensembles | Only craziness I am ashamed about | null | null | null | quant-ph cond-mat.dis-nn hep-th | null | Only craziness I am ashamed about.
| [
{
"version": "v1",
"created": "Tue, 30 Nov 1999 18:29:44 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Dec 1999 10:15:54 GMT"
},
{
"version": "v3",
"created": "Mon, 6 Dec 1999 20:08:24 GMT"
},
{
"version": "v4",
"created": "Sat, 18 Dec 1999 20:35:42 GMT"
},
{
"version": "v5",
"created": "Mon, 26 Sep 2011 17:02:52 GMT"
}
] | 2011-09-27T00:00:00 | [
[
"De Filippo",
"Sergio",
""
]
] |
quant-ph/9911123 | John Henry Reina | John H. Reina (1), Luis Quiroga (2), and Neil F. Johnson (1) ((1)
Oxford University, UK, (2) Universidad de los Andes) | Quantum entanglement and information processing via excitons in
optically-driven quantum dots | 3 separate PostScript Figures + 7 pages. Typos corrected. Minor
changes added. This updated version is to appear in PRA | Phys. Rev. A 62, 12305 (2000) | 10.1103/PhysRevA.62.012305 | null | quant-ph cond-mat.mes-hall | null | We show how optically-driven coupled quantum dots can be used to prepare
maximally entangled Bell and Greenberger-Horne-Zeilinger states. Manipulation
of the strength and duration of the selective light-pulses needed for producing
these highly entangled states provides us with crucial elements for the
processing of solid-state based quantum information. Theoretical predictions
suggest that several hundred single quantum bit rotations and Controlled-Not
gates could be performed before decoherence of the excitonic states takes
place.
| [
{
"version": "v1",
"created": "Tue, 30 Nov 1999 18:36:36 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Mar 2000 23:03:40 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Reina",
"John H.",
""
],
[
"Quiroga",
"Luis",
""
],
[
"Johnson",
"Neil F.",
""
]
] |
quant-ph/9911124 | Richard Cleve | Richard Cleve (U of Calgary) | The query complexity of order-finding | 9 pages, LaTeX, three figures | null | null | null | quant-ph | null | We consider the problem where P is an unknown permutation on {0,1,...,2^n -
1}, y is an element of {0,1,...,2^n - 1}, and the goal is to determine the
minimum r > 0 such that P^r(y) = y (where P^r is P composed with itself r
times). Information about P is available only via queries that yield P^x(y)
from any x in {0,1,...,2^m - 1} and y in {0,1,...,2^n - 1} (where m is
polynomial in n). The main resource under consideration is the number of these
queries. We show that the number of queries necessary to solve the problem in
the classical probabilistic bounded-error model is exponential in n. This
contrasts sharply with the quantum bounded-error model, where a constant number
of queries suffices.
| [
{
"version": "v1",
"created": "Tue, 30 Nov 1999 22:42:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cleve",
"Richard",
"",
"U of Calgary"
]
] |
quant-ph/9912001 | Lov K. Grover | Lov K. Grover (Bell Labs, Murray Hill NJ) | Rapid sampling through quantum computing | The paper has been rewritten. It is to be presented at STOC '00 in
May '00 | null | null | null | quant-ph | null | This paper extends the quantum search class of algorithms to the multiple
solution case. It is shown that, like the basic search algorithm, these too can
be represented as a rotation in an appropriately defined two dimensional vector
space. This yields new applications - an algorithm is presented that can create
an arbitrarily specified quantum superposition on a space of size N in
O(sqrt(N)) steps. By making a measurement on this superposition, it is possible
to obtain a sample according to an arbitrarily specified classical probability
distribution in O(sqrt(N)) steps. A classical algorithm would need O(N) steps.
| [
{
"version": "v1",
"created": "Wed, 1 Dec 1999 03:14:17 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Feb 2000 17:04:11 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Grover",
"Lov K.",
"",
"Bell Labs, Murray Hill NJ"
]
] |
quant-ph/9912002 | Daniel R. Terno | Daniel R.Terno | Comment on `Counterfactual entanglement and non-local correlations in
separable states' | RevTeX, 3 pages | Phys. Rev. A 63 (2001) 016101 | 10.1103/PhysRevA.63.016101 | null | quant-ph | null | The arguments of Cohen [Phys. Rev. A {\bf 60}, 80 (1999)] against the
`ignorance interpretation' of mixed states are questioned. The physical
arguments are shown to be inconsistent and the supporting example illustrates
the opposite of the original statement. The operational difference between two
possible definitions of mixed states is exposed and the inadequacy of one of
them is stressed.
| [
{
"version": "v1",
"created": "Wed, 1 Dec 1999 13:55:56 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Terno",
"Daniel R.",
""
]
] |
quant-ph/9912003 | Shawn Pethel | C. M. Bowden, and S. D. Pethel | Novel Scheme for Universal Quantum Computation | 5 figures | null | null | null | quant-ph | null | A scenario for realization of a quantum computer is proposed consisting of
spatially distributed q-bits fabricated in a host structure where nuclear
spin-spin coupling is mediated by laser pulse controlled electron-nuclear
transferred hyperfine (superhyperfine) Fermi contact interaction. Operations
illustrating entanglement, nonlocality, and quantum control logic operations
are presented and discussed. The notion of universality of quantum computation
is introduced and the irreducible conditions are presented. It is demonstrated
that the proposed generic scenario for realization of a quantum computer
fulfills these conditions.
| [
{
"version": "v1",
"created": "Wed, 1 Dec 1999 14:56:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bowden",
"C. M.",
""
],
[
"Pethel",
"S. D.",
""
]
] |
quant-ph/9912004 | Almut Beige | Almut Beige, Daniel Braun and Peter L. Knight | Driving Atoms Into Decoherence-Free States | 12 pages, 3 figures, more detailed version, accepted for publication
in New Journal of Physics, see http://www.njp.org/ | New J. Phys. 2, 22 (2000) | 10.1088/1367-2630/2/1/322 | 01/12/99 | quant-ph | null | We describe the decoherence-free subspace of N atoms in a cavity, in which
decoherence due to the leakage of photons through the cavity mirrors is
suppressed. We show how the states of the subspace can be entangled with the
help of weak laser pulses, using the high decay rate of the cavity field and
strong coupling between the atoms and the resonator mode. The atoms remain
decoherence-free with a probability which can, in principle, be arbitrarily
close to unity.
| [
{
"version": "v1",
"created": "Wed, 1 Dec 1999 16:18:36 GMT"
},
{
"version": "v2",
"created": "Fri, 30 Jun 2000 17:17:17 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Beige",
"Almut",
""
],
[
"Braun",
"Daniel",
""
],
[
"Knight",
"Peter L.",
""
]
] |
quant-ph/9912005 | L. F. Santos | L. F. Santos and C. O. Escobar | Convergences in the Measurement Problem in Quantum Mechanics | 7 pages, no figures | null | null | null | quant-ph | null | This paper presents arguments purporting to show that von Neumann's
description of the measurement process in quantum mechanics has a modern day
version in the decoherence approach. We claim that this approach and the de
Broglie-Bohm theory emerges from Bohr's interpretation and are therefore
obliged to deal with some obscures ideas which were antecipated, explicitly or
implicitly and carefully circumvented, by Bohr.
| [
{
"version": "v1",
"created": "Wed, 1 Dec 1999 16:42:39 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Santos",
"L. F.",
""
],
[
"Escobar",
"C. O.",
""
]
] |
quant-ph/9912006 | Waldemar Puszkarz | Waldemar Puszkarz | On the Staruszkiewicz Modification of the Schroedinger Equation | Latex, 16 pages | null | null | null | quant-ph | null | We discuss Staruszkiewicz's nonlinear modification of the Schr\"{o}dinger
equation. It is pointed out that the expression for the energy functional for
this modification is not unique as the field-theoretical definition of energy
does not coincide with the quantum-mechanical one. As a result, this
modification can be formulated in three different ways depending on which
physically relevant properties one aims to preserve. Some nonstationary
one-dimensional solutions for suitably chosen potentials, including a KdV
soliton, are presented, and the question of finding stationary solutions is
also discussed. The analysis of physical and mathematical features of the
modification leads to the conclusion that the Staruszkiewicz modification is a
very subtle modification of the fundamental equation of quantum mechanics.
| [
{
"version": "v1",
"created": "Thu, 2 Dec 1999 02:13:51 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Puszkarz",
"Waldemar",
""
]
] |
quant-ph/9912007 | L. F. Santos | L. F. Santos and C. O. Escobar | Burgers Turbulence and the Continuous Spontaneous Localization Model | 15 pages, 2 figures | null | null | null | quant-ph chao-dyn nlin.CD | null | There is a striking convergence between Burgers turbulence and the continuous
spontaneous localization [CSL] model of quantum mechanics. In this paper, we
exploit this analogy showing the similarities in the physics of these two
apparently unrelated problems. It is hoped that the kind of analogy we
introduce here may lead to important developments in both areas.
| [
{
"version": "v1",
"created": "Thu, 2 Dec 1999 15:47:44 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Santos",
"L. F.",
""
],
[
"Escobar",
"C. O.",
""
]
] |
quant-ph/9912008 | Stefano Mancini | S. Mancini (Dip. Fisica, Univ. Milano, Italy), A. M. Martins (Centro
de Fisica de Plasmas, IST Lisboa, Portugal), P. Tombesi (Dip. Matematica e
Fisica, Univ. Camerino, Italy) | Quantum Logic with a Single Trapped Electron | 7 Pages, REVTeX, No Figures, To appear in Phys. Rev. A | Phys. Rev. A 61, 012303 (2000). | 10.1103/PhysRevA.61.012303 | null | quant-ph | null | We propose the use of a trapped electron to implement quantum logic
operations. The fundamental controlled-NOT gate is shown to be feasible. The
two quantum bits are stored in the internal and external (motional) degrees of
freedom.
| [
{
"version": "v1",
"created": "Thu, 2 Dec 1999 16:02:12 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Mancini",
"S.",
"",
"Dip. Fisica, Univ. Milano, Italy"
],
[
"Martins",
"A. M.",
"",
"Centro\n de Fisica de Plasmas, IST Lisboa, Portugal"
],
[
"Tombesi",
"P.",
"",
"Dip. Matematica e\n Fisica, Univ. Camerino, Italy"
]
] |
quant-ph/9912009 | Hoi-Kwong Lo | Hoi-Kwong Lo (MagiQ Technologies, Inc., New York, New York) | Classical Communication Cost in Distributed Quantum Information
Processing - A generalization of Quantum Communication Complexity | Revised Version. Accepted on March 31 for publication in Physical
Review A. Proof of Theorem 3 clarified. A Proviso added to the statement of
Conjecture 4. Related results on randomization and private quantum channel
noted | null | 10.1103/PhysRevA.62.012313 | null | quant-ph | null | We study the amount of classical communication needed for distributed quantum
information processing. In particular, we introduce the concept of "remote
preparation" of a quantum state. Given an ensemble of states, Alice's task is
to help Bob in a distant laboratory to prepare a state of her choice. We find
several examples of an ensemble with an entropy S where the remote preparation
can be done with a communication cost lower than the amount (2S) required by
standard teleportation. We conjecture that, for an arbitrary N-dimensional pure
state, its remote preparation requires 2log_2 N bits of classical
communication, as in standard teleportation.
| [
{
"version": "v1",
"created": "Thu, 2 Dec 1999 20:25:17 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Apr 2000 21:33:16 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Lo",
"Hoi-Kwong",
"",
"MagiQ Technologies, Inc., New York, New York"
]
] |
quant-ph/9912010 | Ignacio Cirac | B. Kraus, J. I. Cirac, S. Karnas, and M. Lewenstein | Separability in 2xN composite quantum systems | Extended version of quant-ph/9903012 with new results. 11 pages | Phys.Rev.A 61, 062302 (2000) | 10.1103/PhysRevA.61.062302 | null | quant-ph | null | We analyze the separability properties of density operators supported on
$\C^2\otimes \C^N$ whose partial transposes are positive operators. We show
that if the rank of $\rho$ equals N then it is separable, and that bound
entangled states have rank larger than N. We also give a separability criterion
for a generic density operator such that the sum of its rank and the one of its
partial transpose does not exceed 3N. If it exceeds this number we show that
one can subtract product vectors until decreasing it to 3N, while keeping the
positivity of $\rho$ and its partial transpose. This automatically gives us a
sufficient criterion for separability for general density operators. We also
prove that all density operators that remain invariant after partial
transposition with respect to the first system are separable.
| [
{
"version": "v1",
"created": "Thu, 2 Dec 1999 18:16:35 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Kraus",
"B.",
""
],
[
"Cirac",
"J. I.",
""
],
[
"Karnas",
"S.",
""
],
[
"Lewenstein",
"M.",
""
]
] |
quant-ph/9912011 | Hoi-Kwong Lo | Hoi-Kwong Lo (MagiQ Technologies Inc., New York, New York) | Will Quantum Cryptography ever become a successful technology in the
marketplace? | 6 pages, RevTex, two-column format | A substantially shortened and edited version appeared in Physics
World, June 2000, p. 17 | null | null | quant-ph | null | We assess the potential of quantum cryptography as a technology. We highlight
the fact that academia and real world have rather different perspectives and
interests. Then, we describe the various real life forces (different types of
users, vendors of crypto-systems, conventional cryptographers, governments)
behind the decision of the adoption (or rejection) of quantum cryptography and
their different interests. Various roadblocks to the widespread application of
quantum cryptography are discussed. Those roadblocks can be fundamental,
technological, psychological, commercial or political and many of them have
nothing to do with the security of quantum key distribution. We argue that the
future success of quantum cryptography as a technology in the marketplace lies
in our ability to appreciate and to overcome those roadblocks and to answer
real world criticisms on the subject.
| [
{
"version": "v1",
"created": "Thu, 2 Dec 1999 21:18:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lo",
"Hoi-Kwong",
"",
"MagiQ Technologies Inc., New York, New York"
]
] |
quant-ph/9912012 | Andr\'es Sicard | Andr\'es Sicard and Mario V\'elez | Some relations between quantum Turing machines and Turing machines | LaTeX, 6 pages. In previous version, we have some problems with
bibliographic references | null | null | null | quant-ph | null | For quantum Turing machines we present three elements: Its components, its
time evolution operator and its local transition function. The components are
related with the components of deterministic Turing machines, the time
evolution operator is related with the evolution of reversible Turing machines
and the local transition function is related with the transition function of
probabilistic and reversible Turing machines.
| [
{
"version": "v1",
"created": "Fri, 3 Dec 1999 00:13:07 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Dec 1999 15:16:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Sicard",
"Andrés",
""
],
[
"Vélez",
"Mario",
""
]
] |
quant-ph/9912013 | Huo Wujun | LIU Yufeng, HUO Wujun and ZENG Jinyan (Department of Physics, Peking
University, Beijing, P. R. China ") | Angular momentum and energy structure of the coherent state of a 2D
isotropic harmonic oscillator | no figure. to appear in Comm. in Theor. Phys | Commum. Theor. Phys. 33, 487 (2000) | null | null | quant-ph | null | The angular momentum structure and energy structure of the coherent state of
a 2D isotropic harmonic oscillator were investigated. Calculations showed that
the average values of angular momentum and energy (except the zero point
energy) of this nonspreading 2D wave packet are identical to those of the
corresponding classical oscillator moving along a circular or an elliptic
orbit.
| [
{
"version": "v1",
"created": "Fri, 3 Dec 1999 02:48:33 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Yufeng",
"LIU",
"",
"Department of Physics, Peking\n University, Beijing, P. R. China \""
],
[
"Wujun",
"HUO",
"",
"Department of Physics, Peking\n University, Beijing, P. R. China \""
],
[
"Jinyan",
"ZENG",
"",
"Department of Physics, Peking\n University, Beijing, P. R. China \""
]
] |
quant-ph/9912014 | Alexander Kozhekin | A. E. Kozhekin, K. Molmer and E. Polzik (University of Aarhus) | Quantum Memory for Light | submittted to PRL | null | 10.1103/PhysRevA.62.033809 | null | quant-ph | null | We propose an efficient method for mapping and storage of a quantum state of
propagating light in atoms. The quantum state of the light pulse is stored in
two sublevels of the ground state of a macroscopic atomic ensemble by
activating a synchronized Raman coupling between the light and atoms. We
discuss applications of the proposal in quantum information processing and in
atomic clocks operating beyond quantum limits of accuracy. The possibility of
transferring the atomic state back on light via teleportation is also
discussed.
| [
{
"version": "v1",
"created": "Fri, 3 Dec 1999 09:47:37 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Kozhekin",
"A. E.",
"",
"University of Aarhus"
],
[
"Molmer",
"K.",
"",
"University of Aarhus"
],
[
"Polzik",
"E.",
"",
"University of Aarhus"
]
] |
quant-ph/9912015 | Michele Pavon | Michele Pavon | Derivation of the wave function collapse in the context of Nelson's
stochastic mechanics | 24 pages | J. Math. Physics 40 (1999), 5565-5577 | 10.1063/1.533046 | null | quant-ph | null | The von Neumann collapse of the quantum mechanical wavefunction after a
position measurement is derived by a purely probabilistic mechanism in the
context of Nelson's stochastic mechanics.
| [
{
"version": "v1",
"created": "Fri, 3 Dec 1999 10:00:19 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Pavon",
"Michele",
""
]
] |
quant-ph/9912016 | Oleg Dorofeyev | B.A. Lysov, O.A. Lysova, O.F. Dorofeyev | Quantum-defect Electron States Near a Helium Surface | 4 pages, LaTex | null | null | null | quant-ph | null | Isolated electrons resting near a helium surface have a spectrum close to
that of a quantum-defect atom. A precisely solvable model with Rydberg spectrum
is sugguested and discussed.
| [
{
"version": "v1",
"created": "Fri, 3 Dec 1999 13:44:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lysov",
"B. A.",
""
],
[
"Lysova",
"O. A.",
""
],
[
"Dorofeyev",
"O. F.",
""
]
] |
quant-ph/9912017 | L. M. Duan | Lu-Ming Duan, G. Giedke, J. I. Cirac, and P. Zoller | Entanglement purification of Gaussian continuous variable quantum states | 4 pages,1 figure, final version | Phys. Rev. Lett. 84, 4002 (2000) | 10.1103/PhysRevLett.84.4002 | null | quant-ph | null | We describe an entanglement purification protocol to generate maximally
entangled states with high efficiencies from two-mode squeezed states or from
mixed Gaussian continuous entangled states. The protocol relies on a local
quantum non-demolition measurement of the total excitation number of several
continuous variable entangled pairs. We propose an optical scheme to do this
kind of measurement using cavity enhanced cross--Kerr interactions.
| [
{
"version": "v1",
"created": "Fri, 3 Dec 1999 14:52:02 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Sep 2000 09:08:19 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Duan",
"Lu-Ming",
""
],
[
"Giedke",
"G.",
""
],
[
"Cirac",
"J. I.",
""
],
[
"Zoller",
"P.",
""
]
] |
quant-ph/9912018 | John Hamilton | John Hamilton | An obstruction based approach to the Kochen-Specker theorem | 14 pages, 6 figures | J. Phys A: Math. Gen 33 (2000) p3783-3794 | 10.1088/0305-4470/33/20/305 | Imperial/TP/99-0/11 | quant-ph | null | In [1] it was shown that the Kochen Specker theorem can be written in terms
of the non-existence of global elements of a certain varying set over the
partially ordered set of boolean subalgebras of projection operators on some
Hilbert space. In this paper, we show how obstructions to the construction of
such global elements arise, and how this provides a new way of looking at
proofs of the theorem.
| [
{
"version": "v1",
"created": "Fri, 3 Dec 1999 14:59:52 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Hamilton",
"John",
""
]
] |
quant-ph/9912019 | George Chapline | George Chapline | Quantum Mechanics as Information Fusion | postscript, 9 pages | null | null | null | quant-ph | null | We provide evidence that quantum mechanics can be interpreted as a rational
algorithm for finding the least complex description for the correlations in the
outputs of sensors in a large array. In particular, by comparing the
self-organization approach to solving the Traveling Salesman Problem with a
solution based on taking the classical limit of a Feynman path integral, we are
led to a connection between the quantum mechanics of motion in a magnetic field
and self-organized information fusion.
| [
{
"version": "v1",
"created": "Sat, 4 Dec 1999 00:29:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chapline",
"George",
""
]
] |
quant-ph/9912020 | Castagnoli Giuseppe | Giuseppe Castagnoli (Elsag Bailey, Genova, Italy) | A Quantum Logic Gate Representation of Quantum Measurement: Reversing
and Unifying the Two Steps of von Neumann's Model | 17 pages, RevTex, 1 PostScript file with figure, submitted to Int. J.
Theor. Phys | null | null | null | quant-ph | null | In former work, quantum computation has been shown to be a problem solving
process essentially affected by both the reversible dynamics leading to the
state before measurement, and the logical-mathematical constraints introduced
by quantum measurement (in particular, the constraint that there is only one
measurement outcome). This dual influence, originated by independent initial
and final conditions, justifies the quantum computation speed-up and is not
representable inside dynamics, namely as a one-way propagation. In this work,
we reformulate von Neumann's model of quantum measurement at the light of above
findings. We embed it in a broader representation based on the quantum logic
gate formalism and capable of describing the interplay between dynamical and
non-dynamical constraints. The two steps of the original model, namely (1)
dynamically reaching a complete entanglement between pointer and quantum object
and (2) enforcing the one-outcome-constraint, are unified and reversed. By
representing step (2) right from the start, the same dynamics of step (1)
yields a probability distribution of mutually exclusive measurement outcomes.
This appears to be a more accurate and complete representation of quantum
measurement. PACS: 03.67.-a, 03.67.Lx, 03.65.Bz
| [
{
"version": "v1",
"created": "Mon, 6 Dec 1999 16:22:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Castagnoli",
"Giuseppe",
"",
"Elsag Bailey, Genova, Italy"
]
] |
quant-ph/9912021 | Toshihiko Ono | Toshihiko Ono | Overview of "Structure behind Mechanics" | 8 pages | null | null | null | quant-ph | null | This letter proposes a new scenario to solve the structural or conceptual
problems remained in quantum mechanics, and gives an overview of the theory
proposed in quant-ph/9906130 (including quant-ph/9909025 and quant-ph/0001015).
| [
{
"version": "v1",
"created": "Sun, 5 Dec 1999 18:10:29 GMT"
},
{
"version": "v2",
"created": "Sun, 19 Dec 1999 19:26:29 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Jan 2000 15:12:00 GMT"
},
{
"version": "v4",
"created": "Mon, 31 Jan 2000 16:20:36 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ono",
"Toshihiko",
""
]
] |
quant-ph/9912022 | Michael Fleischhauer | M. Fleischhauer, S. F. Yelin, M. D. Lukin | How to Trap Photons? Storing Single-Photon Quantum States in Collective
Atomic Excitations | 14 pages, 6 figures, to appear in Optics Communications | null | 10.1016/S0030-4018(99)00679-3 | null | quant-ph | null | We show that it is possible to ``store'' quantum states of single-photon
fields by mapping them onto {\it collective} meta-stable states of an optically
dense, coherently driven medium inside an optical resonator. An adiabatic
technique is suggested which allows to transfer non-classical correlations from
traveling-wave single-photon wave-packets into atomic states and vise versa
with nearly 100% efficiency. In contrast to previous approaches involving
single atoms, the present technique does not require the strong coupling regime
corresponding to high-Q micro-cavities. Instead, intracavity
Electromagnetically Induced Transparency is used to achieve a strong coupling
between the cavity mode and the atoms.
| [
{
"version": "v1",
"created": "Mon, 6 Dec 1999 08:54:28 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Fleischhauer",
"M.",
""
],
[
"Yelin",
"S. F.",
""
],
[
"Lukin",
"M. D.",
""
]
] |
quant-ph/9912023 | Andrea Aiello | Andrea Aiello | Input-Output Relations in Optical Cavities: a Simple Point of View | 34 pages, 5 figures jpg, LaTex | null | 10.1103/PhysRevA.62.063813 | null | quant-ph | null | In this work we present a very simple approach to input-output relations in
optical cavities, limiting ourselves to one- and two-photon states of the
field.
After field quantization, we derive the non-unitary transformation between
{\em Inside} and {\em Outside} annihilation and creation operators. Then we
express the most general two-photon state generated by {\em Inside} creation
operators, through base states generated by {\em Outside} creation operators.
After renormalization of coefficients of inside two-photon state, we calculate
the outside photon-number probability distribution in a general case. Finally
we treat with some detail the single mode and symmetrical cavity case.
| [
{
"version": "v1",
"created": "Mon, 6 Dec 1999 10:40:08 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Aiello",
"Andrea",
""
]
] |
quant-ph/9912024 | Michael Thorwart | M. Thorwart (1), M. Grifoni (2,3) and P. H\"anggi (1), ((1) University
of Augsburg, Germany, (2) University of Karlsruhe (Germany), (3) University
of Genova, Italy) | Strong coupling theory for driven tunneling and vibrational relaxation | 4 LaTeX pages including 3 figures | Phys. Rev. Lett. 85, 860 (2000) | 10.1103/PhysRevLett.85.860 | null | quant-ph | null | We investigate on a unified basis tunneling and vibrational relaxation in
driven dissipative multistable systems described by their N lowest lying
unperturbed levels. By use of the discrete variable representation we derive a
set of coupled non-Markovian master equations. We present analytical treatments
that describe the dynamics in the regime of strong system-bath coupling. Our
findings are corroborated by ``ab-initio'' real-time path integral
calculations.
| [
{
"version": "v1",
"created": "Mon, 6 Dec 1999 14:35:17 GMT"
},
{
"version": "v2",
"created": "Sun, 6 Feb 2000 16:23:42 GMT"
},
{
"version": "v3",
"created": "Wed, 9 Aug 2000 11:02:23 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Thorwart",
"M.",
""
],
[
"Grifoni",
"M.",
""
],
[
"Hänggi",
"P.",
""
]
] |
quant-ph/9912025 | DaeKil Park | ChangSoo Park and D. K. Park | Effect of Aharonov-Bohm Phase on Spin Tunneling | 12 pages, no figure | Mod. Phys. Lett. B, 14 (2000) 919 | 10.1142/S0217984900001130 | null | quant-ph cond-mat hep-th | null | The role of Aharonov-Bohm effect in quantum tunneling is examined when a
potential is defined on the $S^1$ and has $N$-fold symmetry. We show that the
low-lying energy levels split from the $N$-fold degenerate ground state
oscillate as a function of the Aharonov-Bohm phase, from which general
degeneracy conditions depending on the magnetic flux is obtained. We apply
these results to the spin tunneling in a spin system with $N$-fold rotational
symmetry around a hard axis.
| [
{
"version": "v1",
"created": "Tue, 7 Dec 1999 07:17:35 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Aug 2000 20:16:40 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Park",
"ChangSoo",
""
],
[
"Park",
"D. K.",
""
]
] |
quant-ph/9912026 | P. V. Elyutin | P.V. Elyutin and A.N. Rogovenko | On stimulated transitions between the self-trapped states of the
nonlinear Schrodinger equation | 16 pages REVTEX, 5 Postscript figures | null | null | null | quant-ph | null | The studied model describes a particle that obeys a one-dimensional nonlinear
Schr\"odinger equation in the potential of a double-well. Transitions between
the two lowest self-trapped states of this system under the influence of the
external time-dependent perturbation are studied in the two-mode approximation.
If the perturbation dependence on time is harmonic with the frequency $\omega$,
then transitions between the states become possible if the amplitude of the
perturbation $F$ exceeds some threshold value $F_c(\omega)$; above the
threshold motion of the system becomes chaotic. If the perturbation is a
broadband noise, then transitions between the states are possible at
arbitrarily small $F$ and occur in the process of the system's energy
diffusion.
| [
{
"version": "v1",
"created": "Tue, 7 Dec 1999 11:09:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Elyutin",
"P. V.",
""
],
[
"Rogovenko",
"A. N.",
""
]
] |
quant-ph/9912027 | Miloslav Znojil | Miloslav Znojil | PT-symetrically regularized Eckart,Poeschl-Teller and Hulthen potentials | Original 10-page letter ``PT-symmetrized exact solution of the
singular Eckart oscillator" is extended to a full paper | J. Phys. A: Math. Gen. 33 (2000) 4561 - 4572 | 10.1088/0305-4470/33/24/311 | null | quant-ph | null | Version 1: The well known Eckart's singular s-wave potential is
PT-symmetrically regularized and continued to the whole real line. The new
model remains exactly solvable and its bound states remain proportional to
Jacobi polynomials. Its real and discrete spectrum exhibits several unusual
features.
Version 2: Parity times time-reversal symmetry of complex Hamiltonians with
real spectra is usually interpreted as a weaker mathematical substitute for
Hermiticity. Perhaps an equally important role is played by the related
strengthened analyticity assumptions. In a constructive illustration we
complexify a few potentials solvable only in s-wave. Then we continue their
domain from semi-axis to the whole axis and get the new exactly solvable
models. Their energies come out real as expected. The new one-dimensional
spectra themselves differ quite significantly from their s-wave predecessors.
| [
{
"version": "v1",
"created": "Tue, 7 Dec 1999 15:59:10 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Mar 2000 16:52:37 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Znojil",
"Miloslav",
""
]
] |
quant-ph/9912028 | Pierre Meystre | G. A. Prataviera, J. Zapata and P. Meystre | Higher-order mutual coherence of optical and matter waves | 11 pages, 2 figures | null | 10.1103/PhysRevA.62.023605 | null | quant-ph cond-mat physics.atom-ph | null | We use an operational approach to discuss ways to measure the higher-order
cross-correlations between optical and matter-wave fields. We pay particular
attention to the fact that atomic fields actually consist of composite
particles that can easily be separated into their basic constituents by a
detection process such as photoionization. In the case of bosonic fields, that
we specifically consider here, this leads to the appearance in the detection
signal of exchange contributions due to both the composite bosonic field and
its individual fermionic constituents. We also show how time-gated counting
schemes allow to isolate specific contributions to the signal, in particular
involving different orderings of the Schr\"odinger and Maxwell fields.
| [
{
"version": "v1",
"created": "Tue, 7 Dec 1999 16:09:41 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Prataviera",
"G. A.",
""
],
[
"Zapata",
"J.",
""
],
[
"Meystre",
"P.",
""
]
] |
quant-ph/9912029 | Marek Zukowski | Marek Zukowski | Bell Theorem for Nonclassical Part of Quantum Teleportation Process | 4 pages, RevTeX, no figures | null | 10.1103/PhysRevA.62.032101 | null | quant-ph | null | The quantum teleportation process is composed of a joint measurement
performed upon two subsystems A and B (uncorrelated), followed by a unitary
transformation (parameters of which depend on the outcome of the measurement)
performed upon a third subsystem C (EPR correlated with system B). The
information about the outcome of the measurement is transferred by classical
means. The measurement performed upon the systems A and B collapses their joint
wavefunction into one of the four {\it entangled} Bell states. It is shown here
that this measurement process plus a possible measurement on the third
subsystem (with classical channel switched off - no additional unitary
transformation performed) cannot be described by a local realistic theory.
| [
{
"version": "v1",
"created": "Tue, 7 Dec 1999 16:27:21 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Zukowski",
"Marek",
""
]
] |
quant-ph/9912030 | Antonio Cesar Aguiar Pinto | A.C. Aguiar Pinto, M.C. Nemes, J.G. Peixoto de Faria and M.T. Thomaz | Comment on the Adiabatic Condition | 9 pages | Am. J. of Phys. {\bf 68} (2000) 955-958 | 10.1119/1.1285944 | null | quant-ph | null | The experimental observation of effects due to Berry's phase in quantum
systems is certainly one of the most impressive demonstrations of the
correctness of the superposition principle in quantum mechanics. Since Berry's
original paper in 1984, the spin 1/2 coupled with rotating external magnetic
field has been one of the most studied models where those phases appear. We
also consider a special case of this soluble model. A detailed analysis of the
coupled differential equations and comparison with exact results teach us why
the usual procedure (of neglecting nondiagonal terms) is mathematically sound.
| [
{
"version": "v1",
"created": "Tue, 7 Dec 1999 16:28:51 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Mar 2000 17:19:48 GMT"
},
{
"version": "v3",
"created": "Wed, 8 Nov 2000 18:23:31 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Pinto",
"A. C. Aguiar",
""
],
[
"Nemes",
"M. C.",
""
],
[
"de Faria",
"J. G. Peixoto",
""
],
[
"Thomaz",
"M. T.",
""
]
] |
quant-ph/9912031 | Angelo Bassi | Angelo Bassi and GianCarlo Ghirardi | Decoherent Histories and Realism | 34 pages, LaTeX. To appear in Journ. Stat. Phys | J.Statist.Phys. 98 (2000) 457-494 | null | null | quant-ph | null | We reconsider the Decoherent Histories approach to Quantum Mechanics and we
analyze some problems related to its interpretation which, according to us,
have not been adequately clarified by its proponents. We put forward some
assumptions which, in our opinion, are necessary for a realistic interpretation
of the probabilities that the formalism attaches to decoherent histories. We
prove that such assumptions, unless one limits the set of the decoherent
families which can be taken into account, lead to a logical contradiction. The
line of reasoning we will follow is conceptually different from other arguments
which have been presented and which have been rejected by the supporters of the
Decoherent Histories approach. The conclusion is that the Decoherent Histories
approach, to be considered as an interesting realistic alternative to the
orthodox interpretation of Quantum Mechanics, requires the identification of a
mathematically precise criterion to characterize an appropriate set of
decoherent families which does not give rise to any problem.
| [
{
"version": "v1",
"created": "Tue, 7 Dec 1999 17:13:37 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bassi",
"Angelo",
""
],
[
"Ghirardi",
"GianCarlo",
""
]
] |
quant-ph/9912032 | Richard L. Hall | Richard L. Hall | Functional inversion for potentials in quantum mechanics | 14 pages, 2 figures | Phys. Lett. A265, 28-34 (2000) | 10.1016/S0375-9601(99)00872-5 | CUQM-74 | quant-ph math-ph math.MP | null | Let E = F(v) be the ground-state eigenvalue of the Schroedinger Hamiltonian H
= -Delta + vf(x), where the potential shape f(x) is symmetric and monotone
increasing for x > 0, and the coupling parameter v is positive.
If the 'kinetic potential' bar{f}(s) associated with f(x) is defined by the
transformation: bar{f}(s) = F'(v), s = F(v)-vF'(v),then f can be reconstructed
from F by the sequence: f^{[n+1]} = bar{f} o bar{f}^{[n]^{-1}} o f^{[n]}.
Convergence is proved for special classes of potential shape; for other test
cases it is demonstrated numerically. The seed potential shape f^{[0]} need not
be 'close' to the limit f.
| [
{
"version": "v1",
"created": "Tue, 7 Dec 1999 17:34:59 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Hall",
"Richard L.",
""
]
] |
quant-ph/9912033 | Sougato Bose | S. Bose and V. Vedral | Mixedness and teleportation | 6 pages, no figures | null | 10.1103/PhysRevA.61.040101 | null | quant-ph | null | We show that on exceeding a certain degree of mixedness (as quantified by the
von Neumann entropy), entangled states become useless for teleporatation. By
increasing the dimension of the entangled systems, this entropy threshold can
be made arbitrarily close to maximal. This entropy is found to exceed the
entropy threshold sufficient to ensure the failure of dense coding.
| [
{
"version": "v1",
"created": "Tue, 7 Dec 1999 20:26:10 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Bose",
"S.",
""
],
[
"Vedral",
"V.",
""
]
] |
quant-ph/9912034 | Nuno Dias | Nuno Costa Dias | Classicality Criteria | 23 pages. Revised version, to appear in the J. Math. Phys | J. Math. Phys. 43 (2002) 5882-5901 | null | null | quant-ph | null | We present two possible criteria quantifying the degree of classicality of an
arbitrary (finite dimensional) dynamical system. The inputs for these criteria
are the classical dynamical structure of the system together with the quantum
and the classical data providing the two alternative descriptions of its
initial time configuration. It is proved that a general quantum system
satisfying the criteria up to some extend displays a time evolution consistent
with the classical predictions up to some degree and thus it is argued that the
criteria provide a suitable measure of classicality. The features of the
formalism are illustrated through two simple examples.
| [
{
"version": "v1",
"created": "Tue, 7 Dec 1999 22:16:43 GMT"
},
{
"version": "v2",
"created": "Sat, 14 Sep 2002 18:13:22 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Dias",
"Nuno Costa",
""
]
] |
quant-ph/9912035 | Wolfgang Tittel | W. Tittel, H. Zbinden, and N. Gisin | Quantum secret sharing using pseudo-GHZ states | 4 pages including 3 figures and 1 table | null | null | null | quant-ph | null | We present a setup for quantum secret sharing using pseudo-GHZ states based
on energy-time entanglement. In opposition to true GHZ states, our states do
not enable GHZ-type tests of nonlocality, however, they bare the same quantum
correlations. The relatively high coincidence count rates found in our setup
enable for the first time an application of a quantum communication protocoll
based on more than two qubits.
| [
{
"version": "v1",
"created": "Wed, 8 Dec 1999 08:11:49 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Tittel",
"W.",
""
],
[
"Zbinden",
"H.",
""
],
[
"Gisin",
"N.",
""
]
] |
quant-ph/9912036 | Masurao Kamada | Nan-Jian Wu, M. Kamada, A. Natori and H. Yasunaga | Quantum Computer Using Coupled Quantum Dot Molecules | 18 pages, 7 figures, submitted to Jpn. J. Appl. Phys, please send
your e-mail to Nan-Jian Wu <[email protected]> | null | 10.1143/JJAP.39.4642 | null | quant-ph | null | We propose a method for implementation of a quantum computer using artificial
molecules. The artificial molecule consists of two coupled quantum dots stacked
along z direction and one single electron. One-qubit and two-qubit gates are
constructed by one molecule and two coupled molecules, respectively.The ground
state and the first excited state of the molecule are used to encode the |0>
and |1> states of a qubit. The qubit is manipulated by a resonant
electromagnetic wave that is applied directly to the qubit through a microstrip
line. The coupling between two qubits in a quantum controlled NOT gate is
switched on (off) by floating (grounding) the metal film electrodes. We study
the operations of the gates by using a box-shaped quantum dot model and
numerically solving a time-dependent Schridinger equation, and demonstrate that
the quantum gates can perform the quantum computation. The operating speed of
the gates is about one operation per 4ps. The reading operation of the output
of the quantum computer can be performed by detecting the polarization of the
qubits.
| [
{
"version": "v1",
"created": "Wed, 8 Dec 1999 11:02:33 GMT"
},
{
"version": "v2",
"created": "Thu, 9 Dec 1999 12:19:37 GMT"
},
{
"version": "v3",
"created": "Fri, 10 Dec 1999 06:48:04 GMT"
},
{
"version": "v4",
"created": "Wed, 27 Sep 2000 16:05:28 GMT"
},
{
"version": "v5",
"created": "Sat, 7 Oct 2000 13:38:10 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Wu",
"Nan-Jian",
""
],
[
"Kamada",
"M.",
""
],
[
"Natori",
"A.",
""
],
[
"Yasunaga",
"H.",
""
]
] |
quant-ph/9912037 | Jonathan Halliwell | J. J. Halliwell | The Emergence of Hydrodynamic Equations from Quantum Theory: A
Decoherent Histories Analysis | 16 pages, plain Tex. To appear in Proceedings of the 4th Peyresq
Conference, 1999 | null | null | Imperial/TP/99-0/14 | quant-ph | null | The most general description of the classical world is in terms of local
densities (such as number, momentum, energy), and these typically evolve
according to evolution equations of hydrodynamic form. To explain the emergent
classicality of these variables from an underlying quantum theory, it is
therefore necessary to show, firstly, that these variables exhibit negligible
interference, and secondly, that the probabilities for histories of them are
peaked around hydrodynamic evolution. The implementation of this programme in
the context of the decoherent histories approach to quantum theory is
described. It is argued that, for a system of weakly interacting particles, the
eigenstates of local densities (averaged over a sufficiently large volume)
remain approximate eigenstates under time evolution. This is a consequence of
their close connection with the corresponding exactly conserved (and so exactly
decoherent) quantities. The subsequent derivation of hydrodynamic equations
from decoherent histories is discussed.
| [
{
"version": "v1",
"created": "Wed, 8 Dec 1999 15:46:23 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Halliwell",
"J. J.",
""
]
] |
quant-ph/9912038 | Shao-Ming Fei | Sergio Albeverio, Shao-Ming Fei | A Remark on the Optimal Cloning of An N-Level Quantum System | 8 pages, Latex | Eur.Phys.J. B14 (2000) 669-672 | 10.1007/s100510051077 | null | quant-ph cond-mat hep-th | null | We study quantum cloning machines (QCM) that act on an unknown N-level
quantum state and make M copies. We give a formula for the maximum of the
fidelity of cloning and exhibit the unitary transformations that realize this
optimal fidelity. We also extend the results to treat the case of M copies from
$N^\prime$ ($M>N^\prime$) identical N-level quantum systems.
| [
{
"version": "v1",
"created": "Wed, 8 Dec 1999 17:38:02 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Albeverio",
"Sergio",
""
],
[
"Fei",
"Shao-Ming",
""
]
] |
quant-ph/9912039 | Benjamin Schumacher | N. Linden (1), S. Popescu (1), B. Schumacher (2), M. Westmoreland (3)
((1) University of Bristol, (2) Kenyon College, (3) Denison University) | Reversibility of local transformations of multiparticle entanglement | 5 pages, RevTeX (no figures) | null | null | null | quant-ph | null | We consider the transformation of multisystem entangled states by local
quantum operations and classical communication. We show that, for any
reversible transformation, the relative entropy of entanglement for two parties
must remain constant. This shows, for example, that it is not possible to
convert 2N three party GHZ states into 3N singlets, even in an asymptotic
sense. Thus there is true three-party non-locality (i.e., not all three-party
entanglement is equivalent to two-party entanglement). Our results also allow
us to make {\em quantitative} statements about concentrating multi-particle
entanglement. Finally, we show that there is true n-party entanglement for all
n.
| [
{
"version": "v1",
"created": "Wed, 8 Dec 1999 21:40:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Linden",
"N.",
"",
"University of Bristol"
],
[
"Popescu",
"S.",
"",
"University of Bristol"
],
[
"Schumacher",
"B.",
"",
"Kenyon College"
],
[
"Westmoreland",
"M.",
"",
"Denison University"
]
] |
quant-ph/9912040 | Seth Lloyd | Seth Lloyd (MIT), Benjamin Rahn (Harvard), Charlene Ahn (Caltech) | Robust quantum computation by simulation | 8 pages, TeX | null | null | null | quant-ph | null | Simulation of quantum systems that provide intrinsically fault-tolerant
quantum computation is shown to preserve fault tolerance. Errors committed in
the course of simulation are eliminated by the natural error-correcting
features of the systems simulated. Two examples are explored, toric codes and
non-abelian anyons. The latter is shown to provide universal robust quantum
computation via simulation.
| [
{
"version": "v1",
"created": "Wed, 8 Dec 1999 22:38:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lloyd",
"Seth",
"",
"MIT"
],
[
"Rahn",
"Benjamin",
"",
"Harvard"
],
[
"Ahn",
"Charlene",
"",
"Caltech"
]
] |
quant-ph/9912041 | Benni Reznik | Yakir Aharonov and Benni Reznik | Local/Non-Local Complementarity in Topological Effects | 4 pages | Phys. Rev. Lett. 84, 4790 (2000). | 10.1103/PhysRevLett.84.4790 | null | quant-ph | null | In certain topological effects the accumulation of a quantum phase shift is
accompanied by a local observable effect. We show that such effects manifest a
complementarity between non-local and local attributes of the topology, which
is reminiscent but yet different from the usual wave-particle complementarity.
This complementarity is not a consequence of non-commutativity, rather it is
due to the non-canonical nature of the observables. We suggest that a
local/non-local complementarity is a general feature of topological effects
that are ``dual'' to the AB effect.
| [
{
"version": "v1",
"created": "Thu, 9 Dec 1999 09:21:33 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Aharonov",
"Yakir",
""
],
[
"Reznik",
"Benni",
""
]
] |
quant-ph/9912042 | null | G. K\"albermann (Soil and Water department, Faculty of Agriculture,
Israel) | Wave packet scattering from an attractive well | Final version, Journal of Physics A, to be published | J.Phys.A34:3841-3858,2001 | 10.1088/0305-4470/34/18/312 | null | quant-ph nucl-th | null | Wave packet scattering off an attractive well is investigated in two spatial
dimensions numerically. The results confirm what was found previously for the
one dimensional case. The wave scattered at large angles is a polychotomous
(multiple peak) coherent train. Large angle scattering is extremely important
for low impinging velocities and at all impact parameters. The effect
disappears for packets more extended than the well. Experiments to detect the
polychotomous behavior are suggested.
| [
{
"version": "v1",
"created": "Thu, 9 Dec 1999 10:52:45 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Mar 2001 08:05:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kälbermann",
"G.",
"",
"Soil and Water department, Faculty of Agriculture,\n Israel"
]
] |
quant-ph/9912043 | null | M.Genovese, C. Novero | Quantum non-demolition (QND) modulation of quantum interference | accepted for publication | Phys. Rev. A 61 032102 (2000) | 10.1103/PhysRevA.61.032102 | IEN 1999 | quant-ph physics.optics | null | We propose an experiment where quantum interference between two different
paths is modulated by means of a QND measurement on one or both the arm of the
interferometer. The QND measurement is achieved in a Kerr cell. We illustrate a
scheme for the realisation of this experiment and some further developments.
| [
{
"version": "v1",
"created": "Thu, 9 Dec 1999 09:44:39 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Genovese",
"M.",
""
],
[
"Novero",
"C.",
""
]
] |
quant-ph/9912044 | Richard A. Mould | Richard A Mould | A defense of Hellwig-Kraus reductions | 10 pages. 3 figures | null | null | null | quant-ph | null | Aharonov and Albert analyze a thought experiment which they believe shows
that quantum mechanical state reductions occur along temporal hypersurfaces in
Minkowski space. They conclude that the covariant state reduction theory of
Hellwig and Kraus does not apply. In Part I of this paper we disagree with this
interpretation of the A-A experiment, and show the adequacy of the H-K theory.
In Part II we examine the belief that H-K reductions produce self contradicting
causal loops, and/or give rise to absurd boundary conditions. These objections
to the theory are shown to be unfounded.
| [
{
"version": "v1",
"created": "Thu, 9 Dec 1999 14:01:31 GMT"
}
] | 2009-09-25T00:00:00 | [
[
"Mould",
"Richard A",
""
]
] |
quant-ph/9912045 | M. Dima | M. Dima | Quantum Particle-Trajectories and Geometric Phase | 4 pages | published in JETP Lett. 72(11) p. 785 (Dec. 10 2000) | 10.1134/1.1348476 | WUD 99-47 | quant-ph | null | "Particle"-trajectories are defined as integrable $dx_\mu dp^\mu = 0$ paths
in projective space.
Quantum states evolving on such trajectories, open or closed, do not
delocalise in $(x, p)$ projection, the phase associated with the trajectories
being related to the geometric (Berry) phase and the Classical Mechanics
action. High Energy Physics properties of states evolving on
"particle"-trajectories are discussed.
| [
{
"version": "v1",
"created": "Thu, 9 Dec 1999 15:23:43 GMT"
},
{
"version": "v10",
"created": "Fri, 18 May 2001 17:54:22 GMT"
},
{
"version": "v11",
"created": "Mon, 10 Nov 2003 20:41:14 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Jan 2000 13:58:44 GMT"
},
{
"version": "v3",
"created": "Tue, 31 Oct 2000 23:56:43 GMT"
},
{
"version": "v4",
"created": "Wed, 1 Nov 2000 19:59:42 GMT"
},
{
"version": "v5",
"created": "Thu, 2 Nov 2000 22:04:02 GMT"
},
{
"version": "v6",
"created": "Fri, 10 Nov 2000 19:52:54 GMT"
},
{
"version": "v7",
"created": "Sat, 11 Nov 2000 01:33:50 GMT"
},
{
"version": "v8",
"created": "Wed, 29 Nov 2000 20:28:56 GMT"
},
{
"version": "v9",
"created": "Mon, 9 Apr 2001 16:17:56 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Dima",
"M.",
""
]
] |
quant-ph/9912046 | Mikhail Lukin | M.D.Lukin, S.F.Yelin and M.Fleischhauer | Entanglement of Atomic Ensembles by Trapping Correlated Photon States | null | null | 10.1103/PhysRevLett.84.4232 | null | quant-ph | null | We describe a general technique that allows for an ideal transfer of quantum
correlations between light fields and metastable states of matter. The
technique is based on trapping quantum states of photons in coherently driven
atomic media, in which the group velocity is adiabatically reduced to zero. We
discuss possible applications such as quantum state memories, generation of
squeezed atomic states, preparation of entangled atomic ensembles and quantum
information processing.
| [
{
"version": "v1",
"created": "Fri, 10 Dec 1999 01:00:20 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Lukin",
"M. D.",
""
],
[
"Yelin",
"S. F.",
""
],
[
"Fleischhauer",
"M.",
""
]
] |
quant-ph/9912047 | null | Alexander R. Kessel and Vladimir L. Ermakov | Multiqubit Spin | 7 pages, PostScript, no figures; translation of Pis'ma Zh. Eksp.
Teor. Fiz. 70, No. 1, pp. 59-63, 10 July 1999; (Submitted 29 April 1999;
resubmitted 2 June 1999) | JETP Letters 70 (1999) 61-65 | 10.1134/1.568130 | null | quant-ph | null | It is proposed that the state space of a quantum object with a complicated
discrete spectrum can be used as a basis for multiqubit recording and
processing of information in a quantum computer. As an example, nuclear spin
3/2 is considered. The possibilities of writing and reading two quantum bits of
information, preparation of the initial state, implementation of the "rotation"
and "controlled negation" operations, which are sufficient for constructing any
algorithms, are demonstrated.
| [
{
"version": "v1",
"created": "Fri, 10 Dec 1999 12:34:35 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Kessel",
"Alexander R.",
""
],
[
"Ermakov",
"Vladimir L.",
""
]
] |
quant-ph/9912048 | Martin Bojowald | Martin Bojowald and Thomas Strobl | Symplectic Cuts and Projection Quantization | 12 pages, v2: additional examples and a new reference to related work | Int.J.Mod.Phys. D12 (2003) 713-725 | 10.1142/S0218271803002810 | PITHA 99/35, FSUJ-TPI-12/99, ESI 802 | quant-ph gr-qc hep-th math.SG | null | The recently proposed projection quantization, which is a method to quantize
particular subspaces of systems with known quantum theory, is shown to yield a
genuine quantization in several cases. This may be inferred from exact results
established within symplectic cutting.
| [
{
"version": "v1",
"created": "Fri, 10 Dec 1999 14:12:51 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Jun 2000 08:47:28 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Bojowald",
"Martin",
""
],
[
"Strobl",
"Thomas",
""
]
] |
quant-ph/9912049 | Taksu Cheon de Caracorum | Taksu Cheon (Kochi Tech) and T. Shigehara (Saitama U) | Continuous Spectra of Generalized Kronig-Penney Model | LaTeX 6 Pages (include 7 eps figures, use a personal sty file) For
related articles, see also http://www.mech.kochi-tech.ac.jp/cheon/ | Journal of the Physical Society of Japan 73 (2004) 2986-2990 | 10.1143/JPSJ.73.2986 | null | quant-ph cond-mat | null | The standard Kronig-Penney model with periodic $\delta$ potentials is
extended to the cases with generalized contact interactions. The eigen equation
which determines the dispersion relation for one-dimensional periodic array of
the generalized contact interactions is deduced with the transfer matrix
formalism. Numerical results are presented which reveal unexpected band spectra
with broader band gap in higher energy region for generic model with
generalized contact interaction.
| [
{
"version": "v1",
"created": "Fri, 10 Dec 1999 17:40:55 GMT"
},
{
"version": "v2",
"created": "Sat, 11 Dec 1999 01:46:34 GMT"
},
{
"version": "v3",
"created": "Wed, 26 Apr 2006 07:02:01 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cheon",
"Taksu",
"",
"Kochi Tech"
],
[
"Shigehara",
"T.",
"",
"Saitama U"
]
] |
quant-ph/9912050 | Ennio Gozzi | A.A.Abrikosov (jr.), E.Gozzi | Quantization and Time | 4 pages,Latex,uses espcrc2.sty. Talk by E.G at the QG99, Villasimius
(Sardinia, Italy) 13-17 September 99 | Nucl.Phys.Proc.Suppl. 66 (2000) 369 | 10.1016/S0920-5632(00)00804-5 | null | quant-ph gr-qc | null | Starting from a functional formulation of classical mechanics, we show how to
perform its quantization by freezing to zero two Grassmannian partners of time.
| [
{
"version": "v1",
"created": "Fri, 10 Dec 1999 20:37:29 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Abrikosov",
"A. A.",
"",
"jr."
],
[
"Gozzi",
"E.",
""
]
] |
quant-ph/9912051 | Helmut Kroger | C.Q. Huang, H. Kr\"oger, X.Q. Luo and K.J.M. Moriarty | Monte Carlo Hamiltonian from Stochastic Basis | revised version, new figures. Text (LaTeX), 4 Figs. (eps), style file | Phys.Lett. A299 (2002) 483-493 | 10.1016/S0375-9601(02)00750-8 | null | quant-ph hep-lat | null | In order to extend the recently proposed Monte Carlo Hamiltonian to many-body
systems, we suggest to concept of a stochastic basis. We apply it to the chain
of $N_s=9$ coupled anharmonic oscillators. We compute the spectrum of excited
states in a finite energy window and thermodynamical observables free energy,
average energy, entropy and specific heat in a finite temperature window.
Comparing the results of the Monte Carlo Hamiltonian with standard Lagrangian
lattice calculations, we find good agreement. However, the Monte Carlo
Hamiltonian results show less fluctuations under variation of temperature.
| [
{
"version": "v1",
"created": "Fri, 10 Dec 1999 22:10:30 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Jan 2002 14:26:33 GMT"
}
] | 2016-08-15T00:00:00 | [
[
"Huang",
"C. Q.",
""
],
[
"Kröger",
"H.",
""
],
[
"Luo",
"X. Q.",
""
],
[
"Moriarty",
"K. J. M.",
""
]
] |
quant-ph/9912052 | Jonathan P. Dowling | Agedi N. Boto, Pieter Kok, Daniel S. Abrams, Samuel L. Braunstein,
Colin P. Williams, and Jonathan P. Dowling | Quantum Interferometric Optical Lithography: Exploiting Entanglement to
Beat The Diffraction Limit | 9 pages, 2 figures | Phys. Rev. Lett. 85, 2733 (2000) | 10.1103/PhysRevLett.85.2733 | null | quant-ph | null | Classical, interferometric, optical lithography is diffraction limited to
writing features of a size lambda/2 or greater, where lambda is the optical
wavelength. Using nonclassical photon number states, entangled N at a time, we
show that it is possible to write features of minimum size lambda/(2N) in an
N-photon absorbing substrate. This result surpasses the usual classical
diffraction limit by a factor of N. Since the number of features that can be
etched on a two-dimensional surface scales inversely as the square of the
feature size, this allows one to write a factor of N^2 more elements on a
semiconductor chip. A factor of N = 2 can be achieved easily with entangled
photon pairs generated from optical parametric downconversion. It is shown how
to write arbitrary 2D patterns by using this method.
| [
{
"version": "v1",
"created": "Sat, 11 Dec 1999 02:03:29 GMT"
},
{
"version": "v2",
"created": "Thu, 4 May 2000 00:06:50 GMT"
}
] | 2010-04-09T00:00:00 | [
[
"Boto",
"Agedi N.",
""
],
[
"Kok",
"Pieter",
""
],
[
"Abrams",
"Daniel S.",
""
],
[
"Braunstein",
"Samuel L.",
""
],
[
"Williams",
"Colin P.",
""
],
[
"Dowling",
"Jonathan P.",
""
]
] |
quant-ph/9912053 | P. Oscar Boykin | Eli Biham, Michel Boyer, P. Oscar Boykin, Tal Mor, Vwani Roychowdhury | A Proof of the Security of Quantum Key Distribution | null | null | null | null | quant-ph | null | We prove the security of quantum key distribution against the most general
attacks which can be performed on the channel, by an eavesdropper who has
unlimited computation abilities, and the full power allowed by the rules of
classical and quantum physics. A key created that way can then be used to
transmit secure messages in a way that their security is also unaffected in the
future.
| [
{
"version": "v1",
"created": "Sat, 11 Dec 1999 04:58:11 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Biham",
"Eli",
""
],
[
"Boyer",
"Michel",
""
],
[
"Boykin",
"P. Oscar",
""
],
[
"Mor",
"Tal",
""
],
[
"Roychowdhury",
"Vwani",
""
]
] |
quant-ph/9912054 | Brian C. Hall | Brian C. Hall | Holomorphic Methods in Mathematical Physics | Final version | Contemporary Mathematics, Volume 260, pp. 1-59 | null | null | quant-ph math-ph math.MP | null | This set of lecture notes gives an introduction to holomorphic function
spaces as used in mathematical physics. The emphasis is on the Segal-Bargmann
space and the canonical commutation relations. Later sections describe more
advanced topics such as the Segal-Bargmann transform for compact Lie groups and
the infinite-dimensional theory.
| [
{
"version": "v1",
"created": "Sat, 11 Dec 1999 20:51:37 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Sep 2000 23:07:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hall",
"Brian C.",
""
]
] |
quant-ph/9912055 | Michael J. W. Hall | Michael J. W. Hall | Quantum properties of classical Fisher information | 16 pages | Physical Review A 62 (2000) 012107 (6pp.) | 10.1103/PhysRevA.62.012107 | null | quant-ph | null | The Fisher information of a quantum observable is shown to be proportional to
both (i) the difference of a quantum and a classical variance, thus providing a
measure of nonclassicality; and (ii) the rate of entropy increase under
Gaussian diffusion, thus providing a measure of robustness. The joint
nonclassicality of position and momentum observables is shown to be
complementary to their joint robustness in an exact sense.
| [
{
"version": "v1",
"created": "Mon, 13 Dec 1999 23:30:22 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Hall",
"Michael J. W.",
""
]
] |
quant-ph/9912056 | Hagen Kleinert | H.Kleinert, A. Chervyakov | Reparametrization Invariance of Perturbatively Defined Path Integrals.
II. Integrating Products of Distributions | Author Information under
http://www.physik.fu-berlin.de/~kleinert/institution.html . Latest update of
paper also at http://www.physik.fu-berlin.de/~kleinert/302 | Phys.Lett. B47 (2000) 373 | 10.1016/S0370-2693(00)00199-4 | null | quant-ph hep-th | null | We show how to perform integrals over products of distributions in coordinate
space such as to reproduce the results of momentum space Feynman integrals in
dimensional regularization. This ensures the invariance of path integrals under
coordinate transformations. The integrals are uniquely defined by expressing
the propagators in 1- epsilon dimensions in terms of modified Bessel functions.
| [
{
"version": "v1",
"created": "Sun, 12 Dec 1999 11:08:35 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Feb 2000 08:18:57 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Kleinert",
"H.",
""
],
[
"Chervyakov",
"A.",
""
]
] |
quant-ph/9912057 | Mike York | Michael J. York | Permutation Symmetry For Many Particles | null | null | null | null | quant-ph | null | We consider the implications of the Revised Symmetrization Postulate (see
quant-ph/9908078) for states of more than two particles. We show how to create
permutation symmetric state vectors and how to derive alternative state vectors
that may be asymmetric for any pair by creating asymmetric interdependencies in
their state descriptions. Because we can choose any pair to create such an
asymmetry, the usual generalized exclusion rules which result, apply
simultaneously to any pair. However, we distinguish between simultaneous
pairwise exclusion rules and the simultaneous pairwise anti-symmetry of the
conventional symmetrization postulate. We show how to construct a variety of
state vectors with multiple interdependencies in their state descriptions and
various exchange asymmetries - including one which is anti-symmetric under
exchange of two bosons - all without violating the spin-statistics theorem. We
conjecture that it is possible to construct state vectors for arbitrary mixes
of bosons and fermions that emulate the conventional symmetrization postulate
in a limited way and give examples. We also prove that it is not possible to
define a single state vector that simultaneously obeys the conventional
symmetrization postulate in its standard form (in which the exchange phase does
not depend on the spins of additional particles that are present) for every
pair that can be interchanged.
| [
{
"version": "v1",
"created": "Mon, 13 Dec 1999 04:56:42 GMT"
}
] | 2011-09-06T00:00:00 | [
[
"York",
"Michael J.",
""
]
] |
quant-ph/9912058 | Bassano Vacchini | L.Lanz, O.Melsheimer and B.Vacchini | Subdynamics as a mechanism for objective description | latex, 15 pages. Paper submitted to Proc. Conference "Mysteries,
Puzzles And Paradoxes In Quantum Mechanics, Workshop on Entanglement And
Decoherence, Palazzo Feltrinelli, Gargnano, Garda Lake, Italy, 20-25
September, 1999 | J. Mod. Opt. 47 (2000) 2165-2180 | 10.1080/09500340008235139 | null | quant-ph | null | The relationship between microsystems and macrosystems is considered in the
context of quantum field formulation of statistical mechanics: it is argued
that problems on foundations of quantum mechanics can be solved relying on this
relationship. This discussion requires some improvement of non-equilibrium
statistical mechanics that is briefly presented.
| [
{
"version": "v1",
"created": "Mon, 13 Dec 1999 10:19:44 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Lanz",
"L.",
""
],
[
"Melsheimer",
"O.",
""
],
[
"Vacchini",
"B.",
""
]
] |
quant-ph/9912059 | Garnik F. Mkrtchian | T. R. Hovhannisyan, A. G. Markossian and G. F. Mkrtchian (Yerevan
State University) | On the theory of the relativistic cross sections for stimulated
bremsstrahlung on an arbitrary electrostatic potential in the strong
electromagnetic field | Revtex,10 pages,3 figures | null | null | null | quant-ph | null | On the base of relativistic generalized eikonal approximation wave function
the multiphoton cross sections of a Dirac particle bremsstrahlung on an
arbitrary electrostatic potential and strong laser radiation field are
presented. In the limit of the Born approximation the ultimate analytical
formulas for arbitrary polarization of electromagnetic wave have been obtained.
| [
{
"version": "v1",
"created": "Mon, 13 Dec 1999 11:54:31 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hovhannisyan",
"T. R.",
"",
"Yerevan\n State University"
],
[
"Markossian",
"A. G.",
"",
"Yerevan\n State University"
],
[
"Mkrtchian",
"G. F.",
"",
"Yerevan\n State University"
]
] |
quant-ph/9912060 | Andreas Ruschhaupt | Andreas Ruschhaupt | Relativistic Time of Arrival | latex, 13 pages, 6 postscript figures | null | null | null | quant-ph | null | We propose a covariant algorithm for relativistic ideal measurements and for
relativistic continuous measurements, its non-relativistic limit results the
algorithm of the Event-Enhanced Quantum Theory. Therefore an additional
intrinsic parameter, the proper time, is used. As an application we compute the
time of arrival of a particle at a detector and find good agreement between the
expected values of the time of arrival for weak detectors and the results of
the relativistic point-mechanic over a wide range. For very high momentums
there is a small probability for a negative time of arrival, so the expected
times are a bit smaller than the results of the relativistic mechanics.
| [
{
"version": "v1",
"created": "Mon, 13 Dec 1999 12:29:34 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ruschhaupt",
"Andreas",
""
]
] |
Subsets and Splits