Cavity QED detection of interfering matter waves

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T. Bourdel, T. Donner, S. Ritter, A. Öttl, M. Köhl, and T. Esslinger
Institute of Quantum Electronics, ETH Zürich, CH-8093 Zürich, Switzerland

Received 26 January 2006; published 5 April 2006

Weobserve the build-up of a matter wave interference pattern fromsingle atom detection events in a double-slit experiment. The interferencearises from two overlapping atom laser beams extracted from arubidium Bose-Einstein condensate. Our detector is a high-finesse optical cavitywhich realizes a quantum measurement of the presence of anatom and thereby projects delocalized atoms into a state withzero or one atom in the resonator. The experiment revealssimultaneously the granular and the wave nature of matter. Wepresent a setup which is suited for applications in atominterferometry and cavity QED.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.043602
DOI:	10.1103/PhysRevA.73.043602
PACS:	03.75.Dg; 03.75.Pp; 05.30.Jp; 42.50.Pq 03.75.Dg Atom and neutron interferometry 03.75.Pp Atom lasers 05.30.Jp Boson systems (quantum statistical mechanics) 42.50.Pq Cavity quantum electrodynamics; micromasers YEAR: 2006
KEYWORDS:	rubidium, Bose-Einstein condensation, quantum electrodynamics, quantum optics, atom lasers, interferometry

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