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

We characterize correlations in polarization and time of photon pairs generated from a cold cloud of 87Rb 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 in...

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Bibliographic Details
Published in:New journal of physics 2015-09, Vol.17 (9), p.093034
Main Authors: Gulati, Gurpreet Kaur, Srivathsan, Bharath, Chng, Brenda, Cerè, Alessandro, Kurtsiefer, Christian
Format: Article
Language:English
Subjects:
03.65.Wj
03.67.Bg
42.50.Dv
Correlation analysis
Decay
entangled photon pairs
Entanglement
Four-wave mixing
Photons
Physics
Polarization
quantum beats
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Summary:We characterize correlations in polarization and time of photon pairs generated from a cold cloud of 87Rb 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.
ISSN:1367-2630
DOI:10.1088/1367-2630/17/9/093034