Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.71: Poster

Wednesday, March 19, 2014, 16:30–18:30, Spree-Palais

A high NA objective for two-dimensional discrete-time quantum walks — •Felix Kleißler, Stefan Brakhane, Carsten Robens, Stanislav Shestovy, Andrea Alberti, Wolfgang Alt, and Dieter Meschede — Rheinische Friedrich-Wilhelms Universität Bonn, Institut für Angewandte Physik

Recent advances in the detection and coherent manipulation of neutral atoms in single sites of optical lattices allow us to use quantum walks to simulate transport phenomena [1], where the physical information is extracted from the position of the atoms in the lattice.

Our planned apparatus features an in-house designed diffraction-limited high-numerical-aperture imaging system (NA = 0.92) with a spatial resolution of 500 nm. A characterization of the objective by a wavefront analysis and an evaluation of the point-spread function via imaging of a sub-micrometer pinhole will be presented.

First results on the realization of a two-color magneto-optical trap (MOT) working on the D1 and D2 line of Cs will be shown. This layout allows us to cool along the axis of the objective avoiding stray light in the fluorescence images [2].

The high NA objective in combination with a two color illumination are key ingredients to enable us to detect and address atoms down to the level of single lattice-sites in our 2D state-dependent lattice.

References: [1] M. Genske, W. Alt, A. Steffen, A. H. Werner, R. F. Werner, D. Meschede and A. Alberti, Phys. Rev. Lett. 110, 190601 (2013) [2] S. Wu, T. Plisson, R. C. Brown, W. D. Phillips, and J. V. Porto,Phys. Rev. Lett. 103, 173003 (2009)