Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 14: Quantum Gases: Bosons II

Q 14.2: Talk

Monday, March 6, 2017, 17:15–17:30, P 204

Spatially distributed many-particle entanglement in a spinor Bose-Einstein condensate — •Philipp Kunkel, Maximilian Prüfer, Daniel Linnemann, Anika Frölian, Helmut Strobel, Christian-Marcel Schmied, Thomas Gasenzer, and Markus K. Oberthaler — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, 69120 Heidelberg

A key resource for distributed quantum-enhanced protocols are entangled states between spatially separated modes. In spinor Bose-Einstein condensates such nonclassical states are routinely generated by short-ranged contact interactions. Here, we use spin mixing in a tightly confined BEC of ⁸⁷Rb to generate a two-mode squeezed vacuum. Subsequent expansion in a shallow waveguide potential gives rise to non-classical correlations between opposite spatial directions. Local and global observables are used to quantify the continuous variable entanglement which violates an inequality based on the Einstein-Podolsky-Rosen argument.