Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 53: Quanteninformation (Quantencomputer I)

Q 53.1: Vortrag

Donnerstag, 22. März 2007, 12:00–12:15, 5L

Transport of Atoms in Arrays of Dipole Traps — •Andre Lengwenus, Jens Kruse, Manuel Scherer, Markus Wagner, and Gerhard Birkl — Institut für Angewandte Physik, Technische Universität Darmstadt, 64289 Darmstadt, Germany

For the experimental realization of quantum information processing it is essential to perform one- and two-qubit operations in a controlled fashion. In our approach, qubits are inscribed in the hyperfine states of rubidium atoms. The atoms are trapped in a two-dimensional array of well separated optical micro-potentials created by micro-fabricated lens arrays. We already demonstrated single-qubit operations by the coherent coupling of the hyperfine ground states of ⁸⁵Rb by stimulated Raman transitions.

We plan the realization of two-qubit gates by the use of ultracold collisions. For this, atoms have to be transported from one trap position to another. We demonstrate the transfer of atoms in microtraps using steering methods which are based on the variation of the incident angle of the laser beam illuminating the array of microlenses.

With this technique we achieved the transfer of atoms over a distance of more than half of the trap-to-trap separation. This is enough to move two initially well separated arrays on top of each other. Trap losses and temperature evolution during transfer are determined. Furthermore we present first data on an atomic shift register based on two independently switchable micro-trap arrays.