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 Rmax=292±57, which significantly violates the Cauchy-Schwarz inequality R≤1 for classical fields. Decoherence of quantum correlations is observed over τd175 ns, and is described by our model, as is a new scheme to mitigate this effect.
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Polyakov et al. (2004) studied this question.
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