Quantum noise in the parametric oscillator: From squeezed states to coherent-state superpositions
Abstract
We compare the nonclassical states of light produced by a parametric oscillator for quantum noise of different strengths. Increasing noise strength brings a transition from a slightly perturbed classical state showing squeezing to a superposition of coherent states. We use the positive-P representation to illustrate the roles of quantum noise, quantum coherence, nonlinearity, and dissipation in this simple quantum dynamical system.
- Publication:
-
Physical Review Letters
- Pub Date:
- May 1988
- DOI:
- 10.1103/PhysRevLett.60.1836
- Bibcode:
- 1988PhRvL..60.1836W
- Keywords:
-
- Fokker-Planck Equation;
- Noise Spectra;
- Optical Resonators;
- Parametric Amplifiers;
- Squeezed States (Quantum Theory);
- Perturbation Theory;
- Quantum Mechanics;
- Stochastic Processes;
- Optics;
- 42.50.Dv;
- 03.65.Bz;
- 42.50.Kb;
- 42.65.Ky;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- Frequency conversion;
- harmonic generation including higher-order harmonic generation