Quantum limits on noise for a class of nonlinear amplifiers
arXiv:2010.13851 · doi:10.1103/PhysRevA.103.052415
Abstract
Nonlinear amplifiers such as the transistor are ubiquitous in classical technology, but their quantum analogues are not well understood. We introduce a class of nonlinear amplifiers that amplify any normal operator and add only a half-quantum of vacuum noise at the output. In the large-gain limit, when used in conjunction with a noisy linear detector, these amplifiers implement ideal measurements of the normal operator.
arXiv comment8 pages + appendix. V2 ~ published version, including a new section on three mode amplifiers for measuring normal operators
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