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Q: Quantenoptik und Photonik

Q 73: Quantencomputer

Q 73.1: Talk

Wednesday, March 9, 2005, 14:00–14:15, HU 2002

Coherent Manipulation of Atomic States in Dipole Potentials — •Andre Lengwenus, Michael Volk, Wolfgang Ertmer, and Gerhard Birkl — Universität Hannover, Institut für Quantenoptik, Welfengarten 1, 30167 Hannover

For the experimental realization of quantum information processing with neutral atoms, it is essential to investigate methods for the coherent manipulation of the internal states of trapped atoms. Although neutral atoms are more difficult to control than ions, they might be advantageous because of scalability and weaker coupling to the environment which might be leading to longer coherence times. For ultracold Rb85 atoms confined in optical dipole potentials, we experimentally demonstrate the coherent coupling of the hyperfine groundstates by stimulated Raman transitions. With Rabi and Ramsey techniques we investigate the dephasing of the ensemble of atoms. Applying echo spectroscopy, we measure the coherence time of the evolution of the internal states. In order to advance towards a scaleable system of qubits for quantum information processing, we apply these methods in parallel to ensembles of atoms in two-dimensional arrays of optical micro-potentials created by micro-fabricated lens arrays.