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

Abstract

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.

5 pages, 3 figures

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• Postselection-Free Cavity-Enhanced Narrow-Band Orbital Angular Momentum Entangled Photon Source
• Noise suppression in a temporal-multimode quantum memory entangled with a photon via asymmetrical photon-collection channel
• Verifying Energy-Time Entanglement with Irregularly Sampled Correlations
• Photonic quantum information with time-bins: Principles and applications