Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.21: Poster

Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof

3D motional ground state cooling and collective scattering of two atoms 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 3D motional ground state by means of resolved Raman sideband cooling. Two Raman beams are formed by a blue detuned dipole trap and a perpendicularly adjusted running wave driving Raman transitions between two hyperfine ground states. Thereby we strongly suppress motional carrier transitions along the dipole trap axis [1]. Efficient cooling along all three dimensions is implemented with a second pair of Raman beams using the intracavity dipole trap.
Driving two atoms with a probe beam from the side we measure super- and subradient Rayleigh scattering into the cavity depending on the relative distance between the two atoms [2]. The information on the relative phase of the driving and cavity light fields at the atom positions and efficient pinning of the atoms in their 3D optical lattice due two Raman cooling are important for the implementation of two-atom entanglement schemes [3].

[1] R. Reimann et al., New J. Phys. 16, 113042 (2014)

[2] R. Reimann et al., Phys. Rev. Lett. 114, 023601 (2015)

[3] F. Reiter et al., New J. Phys. 14, 053022 (2012)