Einstein-Podolsky-Rosen Entanglement of Narrowband Photons from Cold Atoms

Abstract

Einstein-Podolsky-Rosen (EPR) entanglement introduced in 1935 deals with two particles that are entangled in their positions and momenta. Here we report the first experimental demonstration of EPR position-momentum entanglement of narrowband photon pairs generated from cold atoms. By using two-photon quantum ghost imaging and ghost interference, we demonstrate explicitly that the narrowband photon pairs violate the separability criterion, confirming EPR entanglement. We further demonstrate continuous variable EPR steering for positions and momenta of the two photons. Our new source of EPR-entangled narrowband photons is expected to play an essential role in spatially-multiplexed quantum information processing, such as, storage of quantum correlated images, quantum interface involving hyper-entangled photons, etc.

References in corpus (7)

• Steering, Entanglement, Nonlocality, and the EPR Paradox
• Correlated imaging, quantum and classical
• Experimental realization of sub-shot-noise quantum imaging
• Experimental criteria for steering and the Einstein-Podolsky-Rosen paradox
• Einstein-Podolsky-Rosen paradox in twin images
• Continuous variable quantum computation with spatial degrees of freedom of photons
• Fundamental Limits of Classical and Quantum Imaging

Cited by in corpus (4)

• Wavevector multiplexed quantum memory via spatially-resolved single-photon detection
• Einstein-Podolsky-Rosen Energy-Time Entanglement of Narrowband Biphotons
• Einstein-Podolsky-Rosen paradox in a hybrid bipartite system
• Spatial squeezing in bright twin beams generated with four-wave mixing: constraints on characterization with an EMCCD camera