Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 50: Quantum Gases (Bosons) V

Q 50.1: Talk

Wednesday, March 7, 2018, 14:00–14:15, K 2.020

Detecting genuine multipartite entanglement in a spatially extended Bose-Einstein condensate — •Philipp Kunkel, Maximilian Prüfer, Helmut Strobel, Daniel Linnemann, Anika Frölian, Thomas Gasenzer, Martin Gärttner, and Markus K. Oberthaler — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, 69120 Heidelberg

The ability to produce genuine multipartite entangled states between addressable modes is a prerequisite for engineering states relevant for quantum information tasks such as measurement based quantum computation. We use contact interactions in a tightly confined Bose-Einstein condensate of ⁸⁷Rb to generate an entangled state of indistinguishable particles in a single mode. Subsequent expansion of the atomic cloud in a shallow waveguide potential distributes this entanglement spatially making it addressable via local operations. We verify Einstein-Podolsky-Rosen steering between distinct regions of the expanded atomic cloud by analyzing the correlations between different parts of the absorption image. We show that bipartite steering serves as a witness for genuine multipartite entanglement. With this we demonstrate genuine up to 5-partite entanglement in the elongated condensate.