Einstein-Podolsky-Rosen Energy-Time Entanglement of Narrow-Band Biphotons
Yefeng Mei, Yiru Zhou, Shanchao Zhang, Jian‐Feng Li, Kai-Yu Liao, Hui Yan, Shi-Liang Zhu, Shengwang Du
Abstract
We report the direct characterization of energy-time entanglement of narrow-band 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 nanosecond 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.
Topics & Concepts
Quantum entanglementPhysicsEPR paradoxEinsteinQuantum mechanicsTheoretical physicsQuantumQuantum Mechanics and ApplicationsQuantum Information and CryptographyQuantum Electrodynamics and Casimir Effect