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Spatially distributed multipartite entanglement enables EPR steering of atomic clouds.

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Title: Spatially distributed multipartite entanglement enables EPR steering of atomic clouds.
Authors: Kunkel, Philipp (AUTHOR), Prüfer, Maximilian (AUTHOR), Strobel, Helmut (AUTHOR), Linnemann, Daniel (AUTHOR), Frölian, Anika (AUTHOR), Gasenzer, Thomas (AUTHOR), Gärttner, Martin (AUTHOR), Oberthaler, Markus K. (AUTHOR)
Source: Science (pre-March 2025). 4/27/2018, Vol. 360 Issue 6387, p413-416. 4p. 4 Black and White Photographs, 1 Diagram, 3 Graphs.
Subjects: Quantum entanglement, Bose-Einstein condensation, Einstein-Podolsky-Rosen paradox, Computational steering (Computer science), Quantum theory
Abstract: 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. [ABSTRACT FROM AUTHOR]
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Database: Psychology and Behavioral Sciences Collection
Description
Abstract: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. [ABSTRACT FROM AUTHOR]
ISSN:00368075
DOI:10.1126/science.aao2254