Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 58: Poster: Quantum Optics and Photonics III
Q 58.16: Poster
Donnerstag, 14. März 2019, 16:15–18:15, S Atrium Informatik
Towards the realisation of an atom trap in the evanescent field of a WGM-microresonator — •Luke Masters1, Elisa Will1, Michael Scheucher1, Jürgen Volz1, and Arno Rauschenbeutel1,2 — 1Atominstitut der TU Wien, Austria — 2Humboldt Universität zu Berlin, Germany
Whispering-gallery-mode (WGM) resonators guide light by total internal reflection and provide ultra-high optical quality factors in combination with a small optical mode volume. Coupling a single atom to the evanescent field of a WGM microresonator thus allows one to reach the strong coupling regime [1]. Furthermore, such resonators provide chiral, i.e. propagation direction dependent, light-matter coupling which can be employed for realising novel quantum protocols as well as nonreciprocal quantum devices [2]. However, trapping atoms in the evanescent field of such resonators has not yet been demonstrated, which severely limits the atom-resonator interaction time. We aim to trap single 85Rb atoms in the vicinity of a bottle-microresonator using a standing wave optical dipole trap which is created by retroreflecting a tightly focused beam on the resonator surface [3]. In order to load atoms into the trap, we employ an FPGA-based electronics which allows us to react in 150 ns to an atom arriving in the resonator field and thus to switch on the trap. We will present characterisation measurements of the trap and discuss strategies for optimising the trapping lifetime.
[1] C. Junge et al. Phys. Rev. Lett. 110, 213604 (2013)
[2] M. Scheucher et al. Science 354, 1577 (2016)
[3] J. D. Thompson et al. Science 340, 1202 (2013)