Hannover 2013 – scientific programme

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A: Fachverband Atomphysik

A 29: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 29.24: Poster

Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof

Low-noise absorption detection for sub-shot-noise atom interferometry — •Bernd Lücke, Jan Peise, Wolfgang Ertmer, and Carsten Klempt — Institut für Quantenoptik, Leibniz Universität Hannover, Germany

Atom interferometers are extremely precise measurement tools in a wide field of metrological applications. An interferometer maps the quantity of interest on the number of atoms in its output ports. Therefore a low noise detection of the atoms is crucial. Moreover new entangled states of matter will push the precision of atom interferometers to new limits and thus require even more precise atom detection. In our experiment we create entangled twin Fock states for interferometry beyond the shot noise limit. The measurement of the interferometric sensitivity of this state sets high requirements on our absorption detection. We show how we were able to increase its precision and discuss the effect of photon shot noise as a fundamental limitation for absorption detection.