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Physical Review A

Squeezing in nondegenerate four-wave mixing

M. D. Reid, Daniel F. Walls

Published Jun 1, 1986• 29 citations
Publisher

Abstract

Ways to minimize spontaneous-emission noise due to quantum fluctuations in the medium are a major consideration in experiments designed to produce squeezed states of light. Motivated by the recent experiments of Slusher et al. we present a fully quantized model of nondegenerate four-wave mixing. We show that the spontaneous-emission noise, important at higher intensities in the degenerate case, may be minimized in the nondegenerate case for certain regimes of cavity and medium parameters.

DOI
10.1103/physreva.33.4465

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Quantum theory of nondegenerate four-wave mixing

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A fully quantum-mechanical theory of nondegenerate four-wave mixing in a system of two-level atoms is presented. The squeezing in the output field from an intracavity four-wave-mixing experiment is calculated. The theory is compared with the recent experimental results of Slusher, Hollberg, Yurke, Mertz, and Valley and strategies to improve the squeezing are suggested.

Physical Review A•Dec 1, 1986•115 citations
Ways to minimize spontaneous-emission noise due to quantum fluctuations in the medium are a major consideration in experiments designed to produce squeezed states of light. Motivated by the recent experiments of Slusher et al. we present a fully quantized model of nondegenerate four-wave mixing. We show that the spontaneous-emission noise, important at higher intensities in the degenerate case, may be minimized in the nondegenerate case for certain regimes of cavity and medium parameters.
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Squeezed states of light have been predicted to be generated by four-wave mixing in cavity configurations. Any noise fields in the cavity can degrade or modify these squeezed states. An experiment using a Na atomic beam as the nonlinear mixing medium shows that spontaneous emission from the excited atoms results in a broadband frequency spectrum of noise in the cavity used for squeezing. The limits this noise places on the observed amount of squeezing and possible techniques for avoiding this noise source are discussed.