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Quantum Information and Measurement (QIM)

Spatial entanglement and Einstein-Podolsky-Rosen steering in a Bose-Einstein condensate

Tilman Zibold, Matteo Fadel, Boris Décamps, Philipp Treutlein

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We investigate the spatial entanglement in a spin squeezed Bose-Einstein condensate. The spin correlations found between different spatial regions go beyond classical correlations and reveal spatial non-separability and Einstein-Podolsky-Rosen steering in this many-body system.
DOI
10.1364/qim.2019.s2d.4

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A key resource for distributed quantum-enhanced protocols is entanglement between spatially separated modes. However, the robust generation and detection of entanglement between spatially separated regions of an ultracold atomic system remain a challenge. We used spin mixing in a tightly confined Bose-Einstein condensate to generate an entangled state of indistinguishable particles in a single spatial mode. We show experimentally that this entanglement can be spatially distributed by self-similar expansion of the atomic cloud. We used spatially resolved spin read-out to reveal a particularly strong form of quantum correlations known as Einstein-Podolsky-Rosen (EPR) steering between distinct parts of the expanded cloud. Based on the strength of EPR steering, we constructed a witness, which confirmed genuine 5-partite entanglement.