Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.26: Poster
Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof
Coupling a single trapped atom to a WGM microresonator — •Luke Masters1, Elisa Will2, Michael Scheucher2, Jürgen Volz1, and Arno Rauschenbeutel1 — 1Department of Physics, Humboldt-Universität zu Berlin, Germany — 2Vienna Center for Quantum Science and Technology, TU Wien - Atominstitut, Austria
Strongly coupling single quantum emitters to the guided light field of Whispering-gallery-mode (WGM) resonators allows one to reach the strong coupling regime [1]. Furthermore, this setting provides chiral, i.e. propagation direction-dependent, light-matter coupling which can be employed for realising novel quantum devices [2, 3]. However, trapping atoms close to such resonators has not yet been demonstrated.
We demonstrate the trapping of single 85Rb atoms in the evanescent field of a bottle-microresonator using a standing wave optical dipole trap which is created by retroreflecting a tightly focused beam on the resonator surface [4]. Atoms confined in such trapping fields will experience a spatially varying ac-Stark shift that can exceed the resonator linewidth considerably. To remove this position-dependent shift of the transition frequency of the trapped atom, we implement a dual-colour magic-wavelength trapping technique. This allows one to tune the atomic transition back into resonance with the WGM resonator.
[1] C. Junge et al. Phys. Rev. Lett. 110, 213604 (2013)
[2] M. Scheucher et al. Science 354, 1577 (2016)
[3] O. Bechler et al. Nat. Phys. 14, 996 (2018)
[4] J. D. Thompson et al. Science 340, 1202 (2013)