Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics V

Q 62.68: Poster

Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal

Towards the realisation of an atom trap in the evanescent field of a microresonator — •Luke Masters, Elisa Will, Michael Scheucher, Adele Hilico, Jürgen Volz, and Arno Rauschenbeutel — VCQ, Atominstitut, Stadionallee 2, 1020 Wien, Austria

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 light-matter coupling which can be employed for realising novel quantum protocols [2] as well as nonreciprocal quantum devices [3]. 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 Rubidium atoms in the vicinity of a bottle-microresonator using a standing wave optical dipole trap which is created by retroreflecting a tightly focussed beam on the resonator surface [4]. 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 dipole trap. We will present first characterisations of our trap and discuss methods for detecting and cooling the atoms in the resonator.

[1] C. Junge et al. Phys. Rev. Lett. 110, 213604 (2013), [2] I. Shomroni et al. Science 345, 903 (2014), [3] M. Scheucher et al. Science 354, 1577 (2016), [4] J. D. Thompson et al. Science 340, 1202 (2013).