Matches in SemOpenAlex for { <https://semopenalex.org/work/W2032646487> ?p ?o ?g. }
- W2032646487 abstract "The purpose of a phase-preserving linear amplifier is to make a small signal larger, regardless of its phase, so that it can be perceived by instruments incapable of resolving the original signal, while sacrificing as little as possible in signal-to-noise ratio. Quantum mechanics limits how well this can be done: A high-gain linear amplifier must degrade the signal-to-noise ratio; the noise added by the amplifier, when referred to the input, must be at least half a quantum at the operating frequency. This well-known quantum limit only constrains the second moments of the added noise. Here we derive the quantum constraints on the entire distribution of added noise: We show that any phase-preserving linear amplifier is equivalent to a parametric amplifier with a physical state for the ancillary mode; the noise added to the amplified field mode is distributed according to the Wigner function of the ancilla state." @default.
- W2032646487 created "2016-06-24" @default.
- W2032646487 creator A5054727810 @default.
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- W2032646487 date "2012-12-03" @default.
- W2032646487 modified "2023-09-23" @default.
- W2032646487 title "Quantum limits on phase-preserving linear amplifiers" @default.
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- W2032646487 doi "https://doi.org/10.1103/physreva.86.063802" @default.
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