Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Poster Quanteninformation

Q 34.5: Poster

Tuesday, March 20, 2007, 16:30–18:30, Poster C

A quasi-permanent single-photon source with online verification. — •Bernhard Weber, Markus Hijlkema, Holger Specht, Tobias Müller, Simon Webster, and Gerhard Rempe — MPI für Quantenoptik, Hans-Kopfermann-Str.1, 85748 Garching, Germany

We combine very long trapping times of single atoms in an optical dipole trap inside a high-finesse microcavity with a pulsed scheme for single-photon generation. In our setup, a standing-wave optical dipole trap orthogonally oriented to the cavity mode is loaded with a few cold Rb atoms extracted from a magneto-optical trap. A pump laser illuminating the intersection of the trap lasers and the cavity mode provides, when slightly red-detuned from the cavity, three dimensional cooling forces. They allow for trapping a single atom up to a minute under constant observation via the scattering signal into the cavity. Applying a pulsed sequence of pump pulses and repumping intervals with cooling parameters, we show the antibunching behavior of the photons emitted from the cavity in just one trapping event with a single atom. This enables us to first specify the properties of the emitted light online and second guarantee its subsequent performance as a quasi-permanent single photon source.