Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 85: Poster: Enabling Technologies: Cavity QED

FM 85.5: Poster

Donnerstag, 26. September 2019, 16:30–18:30, Tents

An atom-cavity system for high-bandwidth quantum networks — •Maximilian Ammenwerth, Lukas Ahlheit, Wolfgang Alt, Tobias Macha, Pooja Malik, Deepak Pandey, Hannes Pfeifer, Eduardo Urunuela, and Dieter Meschede — Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115, Bonn, Germany

Miniaturized fiber Fabry-Pérot cavities are robust and integrable atom-light interfaces with emerging applications in fiber-based quantum networks. Their small mode volume allows for the combination of strong light-matter coupling and high input bandwidth [1]. For these open resonators, the well-known technique of cavity cooling is not easily accessible. As an alternative, we present degenerate Raman Sideband Cooling, which makes use of Raman transitions driven by the atom-confining dipole trap beams.

We demonstrate the storage of short light pulses by employing a single rubidium atom coupled to the resonator and an assisting control laser [2]. The optimal control pulse is found from a numerical optimisation based on simulating the system dynamics via the Lindblad master equation. A storage efficiency of (8.2±0.9)% is found for a coherent wavepacket with a full width at half maximum of 5 ns, a duration well below the atomic decay time. The measured efficiency is in good agreement with the numerical simulation encouraging hybrid experiments with semiconductor quantum dots as light sources.

[1] PRL 121, 173603 (2018)

[2] arXiv:1903.10922 (2019)