Spatially distributed multipartite entanglement enables EPR steering of atomic clouds

• Verfasst von: Kunkel, Philipp [VerfasserIn]
• Verfasst von: Prüfer, Maximilian [VerfasserIn]
• Verfasst von: Strobel, Helmut [VerfasserIn]
• Verfasst von: Linnemann, Daniel [VerfasserIn]
• Verfasst von: Frölian, Anika [VerfasserIn]
• Verfasst von: Gasenzer, Thomas [VerfasserIn]
• Verfasst von: Gärttner, Martin [VerfasserIn]
• Verfasst von: Oberthaler, Markus K. [VerfasserIn]
• Titel: Spatially distributed multipartite entanglement enables EPR steering of atomic clouds
• Verf.angabe: Philipp Kunkel, Maximilian Prüfer, Helmut Strobel, Daniel Linnemann, Anika Frölian, Thomas Gasenzer, Martin Gärttner, Markus K. Oberthaler
• Umfang: 4 S.
• Fussnoten: Gesehen am 28.06.2018
• Titel Quelle: Enthalten in: Science
• Jahr Quelle: 2018
• Band/Heft Quelle: 360(2018), 6387, S. 413-416$
• ISSN Quelle: 1095-9203
• DOI: doi:10.1126/science.aao2254
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1576930947

Abstract

A key resource for distributed quantum-enhanced protocols is entanglement between spatially separated modes. Yet, the robust generation and detection of nonlocal entanglement between spatially separated regions of an ultracold atomic system remains a challenge. Here, we use 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 local entanglement can be spatially distributed by self-similar expansion of the atomic cloud. Spatially resolved spin read-out is used to reveal a particularly strong form of quantum correlations known as Einstein-Podolsky-Rosen steering between distinct parts of the expanded cloud. Based on the strength of Einstein-Podolsky-Rosen steering we construct a witness, which testifies up to genuine five-partite entanglement.