Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik

Q 15.23: Poster

Montag, 14. März 2011, 16:30–19:30, P1

Cold atom cavity quantum electrodynamics experiments with ultra-high Q whispering-gallery-mode bottle microresonators — •Danny O’Shea, Christian Junge, Sebastian Nickel, Christian Hauswald, Konstantin Friebe, and Arno Rauschenbeutel — Technische Universität Wien - Atominstitut, Stadionallee 2, 1020 Wien, Austria

We describe an apparatus to deliver cold rubidium atoms to a nanofiber-coupled whispering-gallery-mode bottle microresonator using an atomic fountain. We actively stabilize the frequency of the ultra-high Q resonator mode (Q>100 million) to less than 10% of its linewidth. Moreover, the resonator-nanofiber separation is actively stabilized to a fraction of the resonant wavelength. This represents an important advancement for cavity quantum electrodynamic experiments with monolithic microresonators. On the cold atom side, we show that our atomic fountain creates a moving molasses for cold rubidium atoms with a temperature of 5–10 µK. The turning point of the parabolic trajectory of the atoms can be precisely controlled using an acousto-optic modulator driven by a digital synthesizer. Finally, our progress toward coupling atoms to a mode of the bottle resonator is presented.

Financial support by the DFG, the Volkswagen Foundation, and the ESF is gratefully acknowledged.