Generating quantum correlated twin beams by four-wave mixing in hot cesium vapor

Abstract

Using a nondegenerate four-wave mixing process based on a double-$\Lambda$ scheme in hot cesium vapor, we generate quantum correlated twin beams with a maximum intensity-difference squeezing of 6.5 dB. The substantially improved squeezing can be mainly attributed to very good frequency and phase-difference stability between the pump and probe beams in our experiment. Intensity-difference squeezing can be observed within a wide experimental parameter range, which guarantees its robust generation. Since this scheme produces multi-spatial-mode twin beams at the Cs $D_1$ line, it is of interest for experiments involving quantum imaging and coherent interfaces between atomic and solid-state systems.

arXiv comment6 pages, 5 figures, comments are welcome

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