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Q: Quantenoptik und Photonik

Q 20: Poster Fallen & Kühlung

Q 20.3: Poster

Montag, 7. März 2005, 11:00–12:30, Poster HU

Position control of atoms in a cavity — •Bernhard Weber, Stefan Nußmann, Markus Hijlkema, Axel Kuhn, and Gerhard Rempe — MPI für Quantenoptik, Hans-Kopfermann-Str.1, 85748 Garching

Controlling the motional degrees of freedom of single atoms is the basis for deterministic atom-photon or atom-atom interactions. The system we present allows for precise tuning of the coupling of a single atom to the field of an high finesse optical resonator. This is realized by the use of a far off-resonant dipole trap with a standing wave geometry perpendicular to the cavity axis. The trapping scheme starts with the transfer of cold Rb atoms from a MOT into the cavity mode by means of a guiding dipole trap. When the atoms arrive, we change the trap potential to a standing wave geometry with its focus inside the cavity and select only those atoms trapped inside the cavity mode volume. The atoms are observed via the emission into the cavity mode when pumped from the side, so that the measured intensity is proportional to the atom-cavity-coupling. Turning a glass plate in the optical path of the standing-wave trap changes the position of the antinodes containing atoms, so the coupling to the cavity mode is tunable. This mechanism can be used to select one out of several atoms distributed along the trap axis and position it deterministically inside the cavity mode. This kind of system can provide a quantum register for quantum computing with atoms individually adressable via the cavity.