Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster 2

Q 35.47: Poster

Wednesday, March 14, 2012, 16:30–19:00, Poster.I+II

Reconfigurable addressing and efficient single-atom loading in 2D dipole trap arrays — Malte Schlosser, Sascha Tichelmann, •Moritz Hambach, and Gerhard Birkl — Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt, Germany

Optical dipole potentials such as arrays of focused laser beams provide flexible geometries for the synchronous investigation of multiple atomic quantum systems, as studied e.g. in the fields of quantum degenerate gases, quantum information processing, and quantum simulation with neutral atoms. In our work, we focus on the implementation of trapping geometries based on microfabricated optical elements. This approach allows us to develop flexible and integrable configurations for quantum state storage and manipulation, simultaneously targeting the important issues of single-site addressing and scalability. We report on the investigation of ⁸⁵Rb atoms in two-dimensional arrays of individually addressable dipole traps featuring trap sizes and a tuneable site-separation in the single micrometer regime. The direct control of each trap is provided by a spatial light modulator, thus enabling arbitrary trap configurations as well as the initialization and manipulation of qubits in a flexible, site-specific, and parallelized fashion. Advanced schemes for atom number resolved detection with high efficiency and reliability allow us to probe small ensembles and even single atoms stored in the microtrap array. For single atom preparation we utilize light assisted collisions to improve one atom loading efficiencies beyond Poissonian statistics while eliminating multi-atom events.