Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 21: Quanteninformation (Quantencomputer II)

Q 21.2: Vortrag

Dienstag, 11. März 2008, 16:45–17:00, 1B

Coherent Transport of Atoms in Arrays of Dipole Traps — •Jens Kruse, Andre Lengwenus, Malte Schlosser, Christian Gierl, Joost Sattler, and Gerhard Birkl — Institut für Angewandte Physik, TU Darmstadt, Schlossgartenstr. 7, 64289 Darmstadt

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. By using Ramsey and spin-echo methods we study the effects of transport on the coherence of the system. We observed that the transfer of atoms over a distance of up to the full trap separation does not cause any additional loss of coherence.