Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster 2: Intersectional Session

Q 23.29: Poster

Tuesday, March 15, 2011, 18:00–21:00, P1

Quantum information processing with atoms in arrays of dipole potentials — •Sascha Tichelmann, Malte Schlosser, Jens Kruse, and Gerhard Birkl — Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt

Neutral atoms confined in two-dimensional multi-site potential geometries represent an important experimental approach towards quantum information processing. By using well separated optical micro-potentials created by micro-fabricated lens arrays, we obtain highly controllable and scalable quantum systems with single-site addressability and long coherence times. Our microtrap array accesses the regime of collisional blockade, which allows us to prepare atom distributions with sub-Poissonian statistics.
We achieve a direct control of each trap by implementing a spatial light modulator to create arbitrary trap configurations as well as flexible, site-specific, but also parallelized initialization and coherent manipulation of small ensembles or single ⁸⁵Rb atoms. Towards the entanglement of qubits, we demonstrate the coherent transport of atomic quantum states in a shift register architecture. The shift sequence is based on loading, moving and reloading of two independently controllable microtrap arrays.
We also report on an experimental scheme compensating for the differential lightshift induced by the dipole traps. This "magic-wavelength" behavior results in a strong suppression of dephasing. The scheme is extendable to all alkali elements.