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Q: Quantenoptik und Photonik
Q 15: Quanteninformation II
Q 15.4: Vortrag
Montag, 13. März 2006, 17:45–18:00, HI
Quantum Information Processing with Micro-Structures — •Andre Lengwenus1, Michael Volk2,1, Jens Kruse2,1, Wolfgang Ertmer1, and Gerhard Birkl2 — 1Institut für Quantenoptik, Universität Hannover, Welfengarten 1, 3016 Hannover — 2Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstr. 7, 64289 Darmstadt
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. In order to move towards a scaleable system of qubits for quantum information processing, we apply coherent Raman coupling in parallel to ensembles of atoms in two-dimensional arrays of optical micro-potentials created by micro-fabricated lens arrays. Due to the large lateral separation of neighboring potential wells, each trap is individually addressable. For ultracold Rb85 atoms confined in these optical dipole potentials, we experimentally demonstrate the coherent coupling of the hyperfine ground states by stimulated Raman transitions and investigate the coherence time. The realization of two-qubit gates seems feasible with our system using ultracold collisions. We demonstrate the movement of atoms in our microtraps using steering methods which are based on the variation of the angle of the laser beam illuminating the array of microlenses. With this technique we achieve distances of more than half of the trap-to-trap separation which is enough to move two arrays on top of each other. Trap losses and temperature evolution during movement are determined.