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Polarization entanglement and quantum beats of photon pairs from four-wave mixing in a cold Rb-87 ensemble

We characterize correlations in polarization and time of photon pairs generated from a cold cloud of Rb-87 atoms via a four-wave mixing process in a cascade level scheme. Quantum state tomography reveals entangled polarization states of high purity for each of the decay paths through two different intermediate hyperfine levels. When allowing both decay paths, we observe quantum beats in time-resolved correlation measurements.

preprint2015arXivOpen access
Gurpreet Kaur GulatiBharath SrivathsanBrenda ChngAlessandro CeréChristian Kurtsiefer
quant-ph
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Gurpreet Kaur GulatiBharath SrivathsanBrenda ChngAlessandro CeréChristian Kurtsiefer

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