Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 28: Quantum Gases (Bosons) III

Q 28.1: Invited Talk

Wednesday, March 13, 2019, 10:30–11:00, S HS 037 Informatik

Spatial entanglement patterns and Einstein-Podolsky-Rosen steering in a Bose-Einstein condensate — •Tilman Zibold, Matteo Fadel, Boris Decamps, Yifan Li, and Philipp Treutlein — Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

We investigate the entanglement between spatially separated parts of a spin squeezed Bose-Einstein condensate of rubidium atoms. By resolving the spin distribution we are able to detect correlations between spins in different parts of the cloud. The observed spin correlations go beyond classical correlations and reveal spatial non-separability. 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 many particle system. Our findings could be relevant for future quantum enhanced measurements of spatially varying observables such as electromagnetic fields.