What is the register used for falsettone?
Falsettone Falsettone is a term used in modern Italian musicology to describe a vocal technique used by male opera singers in the past, in which the fluty sounds typical of falsetto singing are amplified by using the same singing technique used in the modal voice register. The result is a bright, powerful tone, often very high-pitched, although the sound is still different from and more feminine than what is produced by the modal voice. The term "falsettone" is also used for the mixed vocal register that can be achieved using this technique.
Ancilla bit In classical computation any memory bit can be turned on or off at will, requiring no prior knowledge or extra gadgetry. This is not the case in quantum (or classical reversible) computation, however, as operations in these models are reversible, while turning a bit on (or off) would lose the information about the initial value of that bit. For this reason, in a quantum computation there is no way to deterministically put bits in a specific prescribed state unless one is given access to bits whose original state is known in advance. Such bits which are known in advance to be in the state are called ancilla bits.