Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 28: Poster Quanteninformation

Q 28.6: Poster

Tuesday, March 11, 2008, 16:30–19:00, Poster C2

Quantum Information Processing with Atoms in Arrays of Dipole Potentials — •Malte Schlosser, Jens Kruse, Andre Lengwenus, Christian Gierl, Joost Sattler, and Gerhard Birkl — Institut für Angewandte Physik, TU Darmstadt, Schlossgartenstr. 7, 64289 Darmstadt

Quantum information processing with neutral atoms represents an important experimental approach complementing systems based on trapped ions. Especially the question of scalability might be easier addressed in the case of neutral atoms. By using ultra-cold atoms in optical dipole traps, one can realize highly controllable systems with long coherence times. In our experiment, we use two-dimensional arrays of optical micro-potentials created by micro-fabricated lens arrays as the architecture for a scalable quantum proecessor. Due to the large lateral separation of neighboring potential wells, each trap is individually addressable. For the qubit manipulation, we apply coherent Raman coupling to the hyperfine ground states of small ensembles of ⁸⁵Rb atoms. We demonstrate the transport of atoms from one trap position to another which is needed for a realization of a two-qubit gate based on ultracold collisions. The scalability of this transport process up to macroscopic distances is shown by performing a repeated hand over of atoms from trap to trap. We present investigations of the coherence of the system using Ramsey and spin-echo methods and observe nearly no loss of coherence while moving the atoms.

We give a detailed overview of the experimental configuration, the experiments performed, and the results obtained.