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Einstein-Podolsky-Rosen Energy-Time Entanglement of Narrowband Biphotons

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arxiv 1911.00723 v1 pith:JZLGAORR submitted 2019-11-02 quant-ph physics.optics

Einstein-Podolsky-Rosen Energy-Time Entanglement of Narrowband Biphotons

classification quant-ph physics.optics
keywords energy-timeentanglementbiphotonseinstein-podolsky-rosenjointnarrowbandtemporalanti-stokes
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report the direct characterization of energy-time entanglement of narrowband biphotons produced from spontaneous four-wave mixing in cold atoms. The Stokes and anti-Stokes two-photon temporal correlation is measured by single-photon counters with nano second temporal resolution, and their joint spectrum is determined by using a narrow linewidth optical cavity. The energy-time entanglement is verified by the joint frequency-time uncertainty product of 0.063 +/- 0.0044, which does not only violate the separability criterion but also satisfies the continuous variable Einstein-Podolsky-Rosen steering inequality.

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