Quantum noise limits for nonlinear, phase-invariant amplifiers

Dmitri Kouznetsov, Roberto Ortega-Martínez, Daniel Rohrlich

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Any quantum device that amplifies coherent states of a field while preserving their phase generates noise. A nonlinear, phase-invariant amplifier may generate less noise, over a range of input field strengths, than any linear amplifier with the same amplification. We present explicit examples of such nonlinear amplifiers and derive lower bounds on the noise generated by a nonlinear, phase-invariant quantum amplifier.

Original languageEnglish
Pages (from-to)1665-1669
Number of pages5
JournalPhysical Review A
Issue number2
StatePublished - 1 Jan 1995
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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