Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 66: Ultracold atoms and molecules II

Q 66.1: Talk

Friday, March 21, 2014, 14:00–14:15, DO26 208

3D motional ground state cooling of a single atom inside a high-finesse cavity — •Natalie Thau, Wolfgang Alt, Tobias Macha, Lothar Ratschbacher, René Reimann, Seokchan Yoon, and Dieter Meschede — Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115 Bonn

Tight control and knowledge of the motional states of single atoms are a prerequisite for many cavity-QED experiments. In our system single cesium atoms coupled to a high finesse optical cavity are cooled close to the 2D motional ground state by means of resolved Raman sideband cooling [1,2]. We drive Raman transitions between two hyperfine ground states, where the blue detuned intracavity dipole trap acts as one of the two perpendicular adjusted Raman beams. Thereby we strongly suppress motional carrier transitions along the cavity axis and implement effective cooling. A Raman spectrum is recorded by mapping out the population of the motional ground states to one hyperfine ground state by Raman transitions for different two-photon detunings. Each time the atomic state is efficiently detected with the cavity as a non-destructive measurement tool. Currently, we expand the scheme to reach 3D ground state cooling.

[1] A. Boca et al., Phys. Rev. Lett. 93, 233603 (2004)

[2] A. Reiserer et al., Phys. Rev. Lett. 110, 223003 (2013)