Title: Coherent long-distance displacement of individual electron spins,
Abstract: Controlling nanocircuits at the single electron spin level is a possible
route for large-scale quantum information processing. In this context,
individual electron spins have been identified as versatile quantum information
carriers to interconnect different nodes of a spin-based semiconductor quantum
circuit. Despite important experimental efforts to control the electron
displacement over long distances, keeping the electron spin coherence after
transfer remained up to now elusive. Here we demonstrate that individual
electron spins can be displaced coherently over a distance of 5 micrometers.
This displacement is realized on a closed path made of three tunnel-coupled
lateral quantum dots. Using fast quantum dot control, the electrons tunnel from
one dot to another at a speed approaching 100 m/s. We find that the spin
coherence length is 8 times longer than expected from the electron spin
coherence without displacement. Such an enhanced spin coherence points at a
process similar to motional narrowing observed in nuclear magnetic resonance
experiments6. The demonstrated coherent displacement will enable long-range
interaction between distant spin-qubits and will open the route towards
non-abelian and holonomic manipulation of a single electron spin.