Jahr 2018
Autor(en) Philipp Kunkel, Maximilian Prüfer, Helmut Strobel, Daniel Linnemann, Anika Frölian, Thomas Gasenzer, Martin Gärttner, and Markus K. Oberthaler
Titel Spatially distributed multipartite entanglement enables EPR steering of atomic clouds
KIP-Nummer HD-KIP 18-84
KIP-Gruppe(n) F17,F20,P3
Dokumentart Paper
Keywords Spatially distributed multipartite entanglement; EPR steering of atomic clouds
Quelle Science 360 (2018) 413-416
doi 10.1126/science.aao2254
Abstract (en)

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.

  author   = {Kunkel, Philipp and Pr{\"u}fer, Maximilian and Strobel, Helmut and Linnemann, Daniel and Fr{\"o}lian, Anika and Gasenzer, Thomas and G{\"a}rttner, Martin and Oberthaler, Markus K},
  title    = {Spatially distributed multipartite entanglement enables EPR steering of atomic clouds},
  journal  = {Science},
  year     = {2018},
  volume   = {360},
  pages    = {413--416},
  doi      = {10.1126/science.aao2254}
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