Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 40: Poster: Quantum Optics and Photonics III

Q 40.13: Poster

Tuesday, March 6, 2018, 16:15–18:15, Zelt West

Towards Single Neutral Atoms in Crossed Fiber Cavities — •Joseph Dale Christesen, Dominik Niemietz, Manuel Brekenfeld, Manuel Uphoff, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching

Cavity quantum electrodynamics provides a rich toolbox for the investigation of fundamental phenomena in quantum physics through increased light-matter coupling which enables many intriguing applications in quantum information processing. One method to further increase the light-matter coupling for a neutral atom trapped in a cavity is to decrease the cavity mode volume. Limits on the reduction of the cavity mode volume imposed by traditional manufacturing processes of the cavity mirrors have been overcome with the introduction of fiber cavities [1], where fiber end facets are machined by means of CO₂ laser ablation. Besides small mode volumes and larger coupling rates, fiber cavities also allow for new cavity geometries due to their smaller dimensions, including coupling a single emitter to two independent and perpendicular cavity modes. We are currently setting up a new experiment consisting of two crossed fiber cavities which realizes this unique cavity geometry and also constitutes an important step towards the implementation of an integrated quantum repeater [2]. We will present the current status and future plans for our apparatus including fabrication results of elliptical and spherical fiber mirrors.

[1] Hunger et al., NJP 12, 065038 (2015)

[2] Uphoff et al., Appl. Phys. B 122, 46 (2016)