Dresden 2011 – scientific programme

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SAMOP-DP: SAMOP Dissertation Prize 2011

SAMOP-DP 1: S-AMOP Dissertation Prize Symposium

SAMOP-DP 1.3: Invited Talk

Tuesday, March 15, 2011, 11:30–12:00, MENSA Dül

Entanglement in spinor Bose-Einstein condensates — •Christian Gross, Tilman Zibold, Eike Nicklas, Helmut Strobel, Jiri Tomkovic, and Markus K Oberthaler — Kirchhoff Institute for Physics, University of Heidelberg

Entanglement is one of the fundamental and most puzzling concepts of quantum mechanics. Besides its fundamental importance for the understanding of many particle quantum mechanics some useful entangled states exist, which can serve as resources for emerging quantum technologies. Spinor condensates are ideal to study entanglement experimentally, since different interaction induced nonlinear terms in the hamiltonian can be used for the generation of different kinds of entangled states. We report on the realization of a quantum enhanced atom interferometer based on spin squeezed states with a sensitivity beyond the classical limit. By tomography we detect a quantum state containing 170 entangled atoms within the interferometer. In a recent experiment we use atomic pair creation due to spin changing collisions to engineer atomic squeezed vacuum states which fulfill Einstein-Podolsky-Rosen type entanglement criteria. Even for large atom numbers we observe a pair coherence above 90% by atomic homodyne detection.