Temporal dynamics of photon pairs generated by an atomic ensemble.

  title={Temporal dynamics of photon pairs generated by an atomic ensemble.},
  author={Sergey Vladimirovich Polyakov and Chin-wen Chou and D. Felinto and Harry J. Kimble},
  journal={Physical review letters},
  volume={93 26 Pt 1},
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=292+/-57, which significantly violates the Cauchy-Schwarz inequality R< or =1 for classical fields. Decoherence of quantum correlations is… 

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Before applying Eq. 1, we reprocess the data for pτ (t1, t2) in Fig. 2 for τ = 30 ns bin size

    we calculate R(t1, t2) for detection events for the (1, 2) fields from different trials j = k, for which R(t j 1 , t k 2 ) is expected to equal unity


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