Temporal Dynamics of Photon Pairs Generated by an Atomic Ensemble

Abstract

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 Vol. 414, p. 413 (2001)]. The correlation function R(t1,t2) for the ratio of cross to auto-correlations 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 175 ns, and is described by our model, as is a new scheme to mitigate this effect.

5 pages, 5 figures

References in corpus (6)

• Long-distance quantum communication with atomic ensembles and linear optics
• Generation of Nonclassical Photon Pairs for Scalable Quantum Communication with Atomic Ensembles
• Quantum State Transfer Between Matter and Light
• Single-Photon Generation from Stored Excitation in an Atomic Ensemble
• Three-dimensional theory for interaction between atomic ensembles and free-space light
• Nonclassical photon pairs generated from a room-temperature atomic ensemble

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