Erlangen 2018 – scientific programme

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A: Fachverband Atomphysik

A 10: Bose-Einstein Condensation (joint session A/Q)

A 10.4: Talk

Monday, March 5, 2018, 14:45–15:00, K 2.016

Spatial entanglement and Einstein-Podolsky-Rosen steering in a Bose-Einstein condensate — •Tilman Zibold, Matteo Fadel, Boris Décamps, and Philipp Treutlein — Department of Physics, University of Basel, Basel, Switzerland

We investigate the spatial entanglement in a spin squeezed Bose-Einstein condensate of rubidium atoms. By letting the atomic cloud expand and using high resolution absorption imaging we are able to access the spatial spin distribution of the many-body state. The observed spin correlations between different regions go beyond classical correlations and reveal spatial non-separability. Furthermore they allow for EPR steering of a subregion of the atomic spin. By inferring measurement outcomes of non-commuting observables in one region based on measurements in a separate region we are able to seemingly beat the Heisenberg uncertainty relation, realizing the EPR paradox with an atomic system. Our findings could be relevant for future quantum enhanced measurements of spatially varying observables such as electromagnetic fields.