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Q: Quantenoptik
Q 4: Quantum Information I
Q 4.4: Vortrag
Montag, 2. April 2001, 16:30–16:45, Audimax
Real-time trapping and manipulation of single, strongly coupled atoms — •Hanns-Christoph Naegerl1, Jason McKeever2, Dan M. Stamper-Kurn2, and H. Jeff Kimble2 — 1Universitaet Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria — 2California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA
Recent Experiments are discussed which demonstrate real-time trapping and monitoring of single atoms within a high finesse optical resonator to be used for Quantum Information purposes. In one experiment, a classical standing-wave far off-resonant trap (FORT) provides the trapping potential. The trapping beam, which is resonant with the cavity mode, is triggered on with the arrival of a single atom, detected by cavity QED coupling to a transmitted probe field. Trapping times of tens of milliseconds have been achieved. The present limitations of the trapping mechanism are discussed. In a second experiment the cavity QED interaction provides the trapping force. This is possible because the single photon atom-field interaction energy is larger than the kinetic energy of the laser-cooled atoms. Again, the potential is triggered by detection of a single atom entering the cavity mode. Clear oscillations of the transmitted probe light trough the cavity show the radial motion of the atom inside the standing wave pattern. From this the atomic trajectory can be reconstructed with high sigal-to-noise ratio.