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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster: Quantum Optics and Photonics I

Q 15.25: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

A novel experiment for coupling a Bose-Einstein condensate with two crossed cavity modes — •Philip Zupancic, Julian Leonard, Andrea Morales, Tilman Esslinger, and Tobias Donner — ETH Zürich, Schweiz

Cavity QED has proven to be a very attractive research area to explore many-body physics using quantum degenerate gases. Over the last decades, the coupling of single atoms, cold ensembles of atoms and Bose-Einstein condensates (BEC) to single modes of the electromagnetic field has been successfully exploited and investigated. To push the research further in this direction we built a novel system involving two intersecting cavities. With this setup we are able to couple a BEC of 87-Rb atoms to two spatially distinct modes of the electromagnetic field. The ultracold cloud is optically transported into the crossed cavity setup by means of a novel designed optical dipole trap involving focus-tunable lenses. Our lens setup allows to change the position of the trap while keeping its waist, and therefore the overall trapping conditions, constant.

We report on recent progress on the implementation of a cavity setup involving two high-finesse optical resonators intersecting under an angle of 60°. The mirrors have been fabricated in order to spatially approach them, thus obtaining maximum single atom coupling rates of several MHz. This setup will allow us to study the coherent interaction of a BEC and the two cavity modes both in internal lambda-level transitions and in spatial self-organization processes in dynamical hexagonal lattices.