Quantum noise limits for nonlinear, phase-invariant amplifiers
Abstract
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.
- Publication:
-
Physical Review A
- Pub Date:
- August 1995
- DOI:
- 10.1103/PhysRevA.52.1665
- arXiv:
- arXiv:cond-mat/9407011
- Bibcode:
- 1995PhRvA..52.1665K
- Keywords:
-
- 42.50.Lc;
- 42.50.Ar;
- 42.60.Da;
- Quantum fluctuations quantum noise and quantum jumps;
- Photon statistics and coherence theory;
- Resonators cavities amplifiers arrays and rings;
- Condensed Matter;
- Quantum Physics
- E-Print:
- RevTeX, 6 pages + 4 figures (included in file