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Nonlinear Dynamics in Optical Systems

Quantum Noise Reduction in Nondegenerate Four-wave Mixing above Threshold

Massimo Brambilla, G. Strini, L. A. Lugiato, Franco Prati

Published Jan 1, 1990• 0 citations
Publisher

Abstract

It is well known that nondegenerate four-wave mixing is one of the main mechanisms to produce nonclassical states of the electromagnetic field. As a matter of fact, the squeezing effect was first observed in this configuration1. Recently, sub-shot noise character in the fluctuations in the difference of the intensities of the two signal beams has been experimentally detected2, in analogy with the well known case of nondegenerate parametric oscillators3.

DOI
10.1364/nldos.1990.ld348

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Physical Review A•Jun 1, 1990•2 citations
It is well known that nondegenerate four-wave mixing is one of the main mechanisms to produce nonclassical states of the electromagnetic field. As a matter of fact, the squeezing effect was first observed in this configuration1. Recently, sub-shot noise character in the fluctuations in the difference of the intensities of the two signal beams has been experimentally detected2, in analogy with the well known case of nondegenerate parametric oscillators3.
It is shown that a four-wave-mixing oscillator [R. Ghosh and G. S. Agarwal, Phys. Rev. A 39, 1582 (1989)] operating above threshold exhibits nonclassical effects in the average phase and the amplitude difference of two radiation fields and shows two-mode squeezing. A maximum of 50% intracavity squeezing is found in the fluctuations of two Hermitian operators corresponding to the average phase and the relative amplitude, which becomes 75% squeezing outside the cavity. The variance in the intensity difference between the two fields is half the shot-noise limit inside the cavity but is perfectly suppressed outside the cavity, and both variances inside and outside the cavity are independent of how far above threshold the oscillator is.