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The time dependence of nonclassical correlations is investigated for two fields (1, 2) generated by an ensemble of cold cesium atoms via the protocol of Duan et al. Nature (London) 414, 413 (2001). The correlation function R (t₁, t₂) for the ratio of cross to autocorrelations for the (1, 2) fields at times (t₁, t₂) is found to have a maximum value R^max=29257, which significantly violates the Cauchy-Schwarz inequality R1 for classical fields. Decoherence of quantum correlations is observed over ₃175 ns, and is described by our model, as is a new scheme to mitigate this effect.
Polyakov et al. (Mon,) studied this question.
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