Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 28: Cold atoms V - optical lattices (joint session A/Q)

Q 28.3: Vortrag

Dienstag, 6. März 2018, 14:30–14:45, K 0.011

Ground state cooling of Cs atoms in state-dependent optical lattices — •Richard Winkelmann, Gautam Ramol, Stefan Brakhane, Goel Moon, Peng Du, Max Werninghaus, Wolgang Alt, Dieter Meschede, and Andrea Alberti — Institute of Applied Physics, Bonn, Germany

We report on experimental realization of ground state cooling of neutral Cs atoms in state dependent optical lattices, which are realized by fast optical polarization synthesis [1]. Two-dimensional polarizationsynthesized optical lattices allow us to employ microwave radiation to couple different motional states in both x- and y-directions; by driving microwave sideband transitions, we succeed to cool atoms into the motional ground state in the xy-plane. A pair of Raman lasers is used to cool atoms in the third dimension, along which atoms are convined by a state-independent optical lattice. We expect to prepare >99% population in the ground state population for each dimension.

Ground state cooling enables both long coherence times and indistinguishability of atoms, which are prerequisites for discrete time quantum walks, the preparation low entropy states via atom sorting [2] and direct measurement of the exchange phase for identical quantum particles [3].

[1] C. Robens et al.,Fast, high-precision optical polarization synthesizer for ultracold-atom experiments., arXiv, 2017. [2] C. Robens et al., Low-entropy states of neutral atoms in polarization-synthesized optical lattices. PRL, 2017. [3] C. F. Roos et al., Revealing quantum statistics with a pair of distant atoms. PRL, 2017.