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A: Fachverband Atomphysik

A 14: Ultra-Cold Atoms, Ions and BEC I (with Q)

A 14.1: Invited Talk

Tuesday, March 3, 2009, 16:30–17:00, VMP 6 HS-C

Squeezing and enanglement in a Bose Einstein condensate — •Markus Oberthaler — Kirchhoff Institut für Physik, University of Heidelberg, Im Neuneheimer Feld 227, 69120 Heidelberg

Generation of spin squeezed states for matter waves is the first step pushing atom interferometry beyond the classical limit due to projection noise. We report on our recent experimental results obtained with a new very stable double well setup combined with high spatial resolution imaging which allows the generation and characterization of number squeezed atomic states. The direct observation of the conjugate variable -- the relative phase -- allows the experimental confirmation of a successfully generated spin squeezed atomic state. The results show that a many particle quantum state has been produced which can improve the precision of Ramsey type interferometer. Furthermore, with the observed squeezing a sufficient criterion for pairwise entanglement can be constructed confirming that for our experimental parameters pairwise entanglement between the atoms exist even at finite temperature. In the conclusion a short overview of the recent group activities will be given.