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Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Effects II

Q 48.8: Vortrag

Donnerstag, 17. März 2022, 12:15–12:30, Q-H13

Coupling a single trapped atom to a whispering-gallery-mode microresonator — •Xinxin Hu², Elisa Will¹, Luke Masters², Arno Rauschenbeutel², Michael Scheucher¹, and Jürgen Volz² — ¹Vienna Center for Quantum Science and Technology, Technische Universität Wien, 1020 Vienna, Austria — ²Department of Physics, Humboldt Universität zu Berlin, 10099 Berlin, Germany

We demonstrate trapping of a single ⁸⁵Rb atom at a distance of 200 nm from the surface of a whispering-gallery-mode bottle microresonator. The atom is trapped in an optical potential, which is created by retroreflecting a red-detuned focused laser beam from the resonator surface. We counteract the trap-induced light shift of the atomic transition frequency by superposing a second laser beam with suitably chosen power and detuning. This allows us to observe a vacuum Rabi-splitting in the excitation spectrum of the coupled atom-resonator system. This first demonstration of stable and controlled interaction of a single atom with a whispering-gallery-mode in the strong coupling regime opens up the route towards the implementation of quantum protocols and applications that harvest the chiral atom-light coupling present in this class of resonators.