Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Information: Atoms and Ions I

Q 17.2: Group Report

Tuesday, March 9, 2010, 14:30–15:00, E 214

Scalable Architecture for Quantum Information Processing with Neutral Atoms — •Jens Kruse, Malte Schlosser, Peter Schauss, Benedikt Baumgarten, Sascha Tichelmann, and Gerhard Birkl — Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt

Ultra-cold atoms in two-dimensional dipole trap arrays represent highly controllable and scalable systems for quantum information processing with long coherence times. In our experiment, we use sets of optical micro-potentials created by micro-fabricated lens arrays as the architecture for a scalable quantum processor. Advanced schemes for atom detection allow us to observe single atoms with high efficiency and reliability in a site-selective and state-specific fashion.

We report on a series of important advances: For flexible architectures, we implement a spatial light modulator in front of a microlens array as a pixel-addressable intensity modulator for the realization of arbitrary trapping configurations. We demonstrate the initialization and coherent manipulation of small ensembles of ⁸⁵Rb atoms at separatly addressable sites by applying coherent Raman coupling between hyperfine ground states. We also present an experimental scheme compensating for the differential lightshift induced by the trapping light. This ”magic-wavelength” behavior synchronizes the coherent evolution and results in an increase of the spectroscopic resolution and a strong suppression of dephasing. The scheme is extendable to all alkali elements where no standard ”magic-wavelength” is available and opens new avenues in metrology and quantum computing.