Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.8: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent B

Towards deterministic strong coupling between single trapped atoms and a Whispering-Gallery-Mode microresonator — •xinxin hu, luke masters, gabriele maron, arno rauschenbeutel, and juergen volz — Department of Physics, Humboldt-Universität zu Berlin, Berlin, Germany

In the past decades, coupling between single trapped atoms and high Q factor microresonators has been a strong research focus because a resonator can significantly enhance of light-atom interaction and realize strong coupling. More recently, aided by the progress of materials and microfabrication technology, more integratable resonator types, e.g. photonic crystal cavities and optical nanofiber-based cavities, have been explored in single-atom CQED systems, and many breakthroughs have been achieved in such systems. Of particular interest are whispering-gallery-mode resonators, such as microsphere or microtoroid resonators that exhibit extremely high Q-factors exceeding 10^9. Here, we present the work of our group towards deterministic strong coupling of single trapped atoms to a bottle-type WGM microresonator. In our experiment we load a single atom from a magneto optical trap into an optical tweezer. Subsequently, using a focus tunable lens, we move the trapped atoms over a distance of ~1mm into the evanescent field of the WGM resonator. We will report on the efficiency of the atom transport close to and into the evanescent field of the resonator.

Keywords: Cavity QED; strong coupling; Whispering-Gallery-Mode microresonator; optical tweezer; atom transportation