Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.14: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

A High-Speed Imaging System and a Two-Colour Magneto-Optical Trap for Discrete-Time Quantum Walks — •Volker Schilling, Stefan Brakhane, Stanislav Shestovy, Felix Kleißler, Wolfgang Alt, Andrea Alberti, and Dieter Meschede — Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115 Bonn

We report on a vacuum compatible imaging system for fluorescence detection and coherent manipulation of neutral Cs atoms in single sites of a two-dimensional state-dependent optical lattice with a diffraction limited resolution of ∼ 560 nm. The imaging system is based on an in-house designed objective featuring a numerical aperture of 0.92 at a working distance of 150 µm. It is placed inside a low-birefringence ultra-high vacuum glass cell. Experimental techniques for the characterization of high numerical aperture objectives including field of view measurements will be shown.

We will further present first results on the realization of a two-colour magneto-optical trap in front of the objective. The replacement of the D2 line light of Cs by the D1 line along the optical axis of the objective will enable us to effectively cool the atoms during illumination while suppressing stray light.

The high-resolution imaging system in combination with a state-dependent lattice will enable us to simulate complex physical phenomena, for instance, artificial magnetic fields [1] by means of discrete-time quantum walks in two dimensions.

[1] M. Genske, et al., Phys. Rev. Lett. 110, 190601 (2013).