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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.
Reid et al. (Mon,) studied this question.