Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 15: Ultracold atoms and BEC - II (with A)

Q 15.2: Talk

Monday, March 6, 2017, 17:15–17:30, N 1

Phase coherence and entanglement in Bose-Einstein condensates — •Tilman Zibold, Matteo Fadel, Roman Schmied, Baptiste Allard, Jean-Daniel Bancal, Nicolas Sangouard, and Philipp Treutlein — Department of Physics, University of Basel, Basel, Switzerland

We perform quantum enhanced metrology on an atom chip using internal states of Bose- Einstein condensed ⁸⁷Rb atoms. State dependent trapping potentials allow for the generation of entangled states such as squeezed states via interatomic interactions. By accounting for the atom number dependent phase shifts in the system we are able to produce strongly squeezed states. Our recent experiments demonstrate that these many-particle entangled states can exhibit Bell correlations [1]. We will discuss experiments on the limitations of phase coherence of squeezed atomic states and recent advances towards a Bell-test with split Bose-Einstein condensates.
Schmied et al. Science 352, 441 (2016)