Sub shot-noise intensity fluctuations in a four-wave mixing oscillator

Gagik Yu. Kryuchkyan, Karen V. Kheruntsyan

Weiping Zhang, Daniel F. Walls

We calculate the spectrum of fluctuations in the intensity difference of two weak fields generated in nondegenerate four-wave mixing in an atomic system. The effects of spontaneous emission and Doppler broadening are included. The conditions for optimum noise suppression below the shot-noise level are discussed.

F. Castelli, Pierfranco Dotti

Weiping Zhang, Daniel F. Walls

Recent experiments by Heidman et al.1 on parametric oscillation have shown that intensity fluctuations reduced below the shot noise may be obtained in the difference of the signal and idler intensities. This quantum noise reduction in the intensity difference is a consequence of the fact that the signal and idler photons are produced in pairs. We study quantum noise reduction in the intensity difference of the two weak fields generated in four-wave mixing.

Massimo Brambilla, G. Strini, L. A. Lugiato +1 more

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.

Jacques Arnaud