Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 17: Ultra-cold atoms, ions and BEC IV (with Q)

A 17.2: Talk

Wednesday, March 16, 2011, 16:45–17:00, BAR 205

Atomic homodyne detection of two mode squeezed states — •Helmut Strobel, Christian Gross, Eike Nicklas, Tilman Zibold, Jiri Tomkovic, and Markus K Oberthaler — Kirchhoff Institute for Physics, University of Heidelberg, Germany

In quantum optics homodyning is a very successful and widely used measurement technique that reveals the quadratures of the electric field. Its counterpart for Quantum Atom Optics, the measurement of the quadratures of a matter wave field, has not been realized so far. Here we present a homodyne measurement of the matter wave quadratures of two mode squeezed atomic quantum states produced by spin changing collisions in a Bose-Einstein condensate. Our measurements reveal strong correlation between the two largely occupied modes and show the existence of a non-vanishing pair phase, i.e. pair coherence. The observed noise level in the two mode quadratures is below the threshold expected for classical states and hence flags entanglement in the system.