Strong relative intensity squeezing by four-wave mixing in rubidium vapor.
We have measured -3.5 dB (-8.1 dB corrected for losses) relative intensity squeezing between probe and conjugate beams generated by stimulated, nondegenerate four-wave mixing in hot rubidium vapor. Unlike early observations of squeezing in atomic vapors based on saturation of a two-level system, our scheme uses a resonant nonlinearity based on ground-state coherences in a three-level system. Since this scheme produces narrowband, squeezed light near an atomic resonance, it is of interest for experiments involving cold atoms or atomic ensembles.
McCormick
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Atomic Physics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8424, USA.
Boyer
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Arimondo
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Lett
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