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Frontiers in Optics

Einstein-Podolsky-Rosen Position-Momentum Entanglement in a Quantum Memory Setup

Michał Dąbrowski, Michal P. Parniak, Radosław Chrapkiewicz, Wojciech Wasilewski

Published Jan 1, 2016• 0 citations
Publisher

Abstract

Raman scattering emissive multimode quantum memory setup is presented. The memory enables storage of photonic position-momentum entanglement, demonstrating a time-delayed Einstein-Podolsky-Rosen paradox.
DOI
10.1364/fio.2016.fw3f.3

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Entanglement of light and matter is an essential resource for effective quantum engineering. In particular, collective states of atomic ensembles are robust against decoherence while preserving the possibility of strong interaction with quantum states of light. While previous approaches to continous-variable quantum interfaces relied on quadratures of light, here we present an approach based on spatial structure of light-atom entanglement. We create and characterize a 12-dimensional entangled state exhibiting quantum correlations between a photon and an atomic ensemble in position and momentum bases. This state allows us to demonstrate the original Einstein-Podolsky-Rosen (EPR) paradox with two different entities, with an unprecedented delay time of 6 μμμs between generation of entanglement and detection of the atomic state.
Abstract Spatial entanglement is at the heart of quantum enhanced imaging applications and high-dimensional quantum information protocols. In particular, for imaging and sensing applications, quantum states with a macroscopic number of photons are needed to provide a real advantage over the classical state-of-the-art. We demonstrate the Einstein–Podolsky–Rosen (EPR) paradox in its original position and momentum form with bright twin beams of light by showing the presence of EPR spatial (position–momentum) entanglement. An electron-multiplying charge-coupled-device camera is used to record images of the bright twin beams in the near and far field regimes to achieve an apparent violation of the uncertainty principle by more than an order of magnitude, which remains statistically significant even in the limit of a small number of images. We further show that the presence of quantum correlations in the spatial and temporal degrees of freedom leads to spatial squeezing of the bright twin beams in both the near and far fields. This provides another verification of the spatial entanglement and points to the presence of hyperentanglement in the bright twin beams.