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Q: Fachverband Quantenoptik und Photonik
Q 42: Quanteninformation: Atome und Ionen II
Q 42.6: Talk
Thursday, March 5, 2009, 11:45–12:00, Audi-B
Scalable Architecture for Quantum Information Processing with Atoms — •Jens Kruse, Malte Schlosser, Christoph Ewen, Peter Schauß, Christian Gierl, and Gerhard Birkl — Institut für Angewandte Physik, Technische Universität Darmstadt, Schloßgartenstr. 7, 64289 Darmstadt
Quantum information processing with neutral atoms represents an important experimental approach complementing systems based on trapped ions. By using ultra-cold atoms in two-dimensional dipole trap arrays, one can realize highly controllable and scalable systems 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. Due to the large lateral separation of neighboring potential wells, each trap is individually addressable. For flexible architectures, we implement a liquid crystal display in front of a microlens array as a pixel-addressable intensity modulator. By this we are able to control each potential well separately and produce arbitrary trap configurations. We demonstrate the flexible site-specific initialization and coherent manipulation of separated small ensembles of 85Rb atoms in two-dimensional trap arrays by applying coherent Raman coupling between hyperfine ground states, representing the qubit states.
Advanced schemes for scalable atom observation allow us to detect single atoms in two-dimensional sets of dipole traps with high efficiency and reliability.