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Q: Quantenoptik
Q 7: Quantum Information II
Q 7.2: Talk
Monday, April 2, 2001, 17:45–18:00, Audimax
Towards State Control and Quantum Logic in a CO2-Laser Optical Lattice — •Giovanni Cennini1, Rainer Scheunemann1,2, Francesco Cataliotti1, and Martin Weitz1,2 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str.1, 85748 Garching — 2Sektion der Physik der Universität München, Schellingstr.4, 80799 München
In optical lattices, cold atoms are trapped by dipole forces in periodic potentials created by the ac-Stark shift of interfering laser beams. Far detuned optical lattices have been regarded as attractive systems for quantum computing. We report the possibilities of manipulating ultracold rubidium atoms collected at the antinodes of an extremely far detuned one dimensional optical lattice, formed by an infrared standing wave with wavelength near 10.6µm. Rubidium atoms are cooled and trapped in a magneto-optical trap, and then transferred into a CO2 laser optical lattice. Due to the extremely large detuning, the photon scattering rate is drastically reduced and exceeds 10 minutes. As the lattice constant is comparatively large, it was possible to selectively address atoms in individual lattice sites by focused resonant light pulses. Further, the possibility to achieve steep traps permits a very tight confinement, such that the so-called Lamb-Dicke regime is fulfilled. This is a suitable starting point for implementing Raman-Sideband-cooling to cool atoms to the ground state of the lattice wells. We are planning to entangle atoms in different trap sites by cold, controlled collisions. A cooling into the ground state is required to avoid rapid decoherence. We report on recent progress of the experiment.