Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 12: Ultra-cold atoms, ions and BEC

A 12.29: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik

3D ground state cooling in a polarization synthesized optical lattice — •Gautam Ramola, Richard Winkelmann, Muhib Omar, Karthik Chandrashekara, Weiqi Zhou, Wolfgang Alt, Dieter Meschede, and Andrea Alberti — Institute for Applied Physics, University of Bonn

Cooling atoms to their motional ground state allows us to prepare ensembles of indistinguishable atoms. Moreover, it extends their coherence times in interferometric applications. We use two polarization synthesized lattice beams to transport Cs atoms deterministically along the x- and y-directions, based on their internal state [1]. State-dependent shifts of our lattice potentials allow us to drive microwave sideband transitions with a tunable Frank-Condon factor, which in turn are used to cool atoms to the ground state along the two dimensions. Alongside microwave sideband cooling, we use a pair of Raman lasers to cool the atoms along the third dimension. With a 3D ground state population of more than 90%, we plan to perform a direct interferometric measurement of the exchange phase for identical quantum particles [2].

[1] C. Robens, S. Brakhane, W. Alt, D. Meschede, J. Zopes and A. Alberti,Fast, High-Precision Optical Polarization Synthesizer for Ultracold-Atom Experiments, Phys. Rev. Applied 9 (2018)

[2] C. F. Roos, A. Alberti, D. Meschede, P. Hauke and H. Häffner, Revealing Quantum Statistics with a Pair of Distant Atoms, Phys. Rev. Lett. 119 (2017)