Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 6: Quanteninformation (Photonen und nichtklassisches Licht II)

Q 6.1: Vortrag

Montag, 19. März 2007, 14:00–14:15, 5L

A Single-Photon Server with Just One Atom — •Markus Hijlkema, Bernhard Weber, Holger Specht, Simon Webster, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans Kopfermann-Str. 1, 85748 Garching, Germany

In this contribution we present results on an experiment where just one single atom trapped in the mode of a high-finesse microcavity is used to generate single photons in a deterministic way. In our scheme, a single atom is trapped in a standing wave dipole potential, created by two counterpropagating laser beams. The focus of these laserbeams overlaps with the mode of our cavity. First, the atom is cooled down in the trap by applying a laser beam incident perpendicular to the cavity and under an angle of 45 degrees with respect to the trapping lasers. Second, a sequence of laserpulses is used to stimulate single-photon emission into the cavity, and subsequent recycling of the atom back into the initial state. The atom is cooled during the recycling phase if suitable parameters are chosen. It is thus possible to extend the lifetime of the atom in the trap up to several 10 seconds, while at the same time producing single-photons. The large number of photons generated in this way display a clear antibunching in the photon arrival times as can be determined from just a single run.