Quantum limits on phase-preserving linear amplifiers

Caves, Carlton M., Combes, Joshua, Jiang, Zhang and Pandey, Shashank (2012) Quantum limits on phase-preserving linear amplifiers. Physical Review A, 86 6: 063802-1-063802-21. doi:10.1103/PhysRevA.86.063802

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Author Caves, Carlton M.
Combes, Joshua
Jiang, Zhang
Pandey, Shashank
Title Quantum limits on phase-preserving linear amplifiers
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2012-12-03
Year available 2012
Sub-type Article (original research)
DOI 10.1103/PhysRevA.86.063802
Open Access Status File (Publisher version)
Volume 86
Issue 6
Start page 063802-1
End page 063802-21
Total pages 21
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2013
Language eng
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.
Keyword Phase-preserving linear amplifier
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2013 Collection
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Citation counts: TR Web of Science Citation Count  Cited 19 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 18 times in Scopus Article | Citations
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