Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.79: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Coherent Rydberg dynamics and interaction in thermal vapor cells — •Bernhard Huber, Andreas Kölle, Fabian Ripka, Robert Löw, and Tilman Pfau — 5. Physikalisches Institut, Uni Stuttgart

Rydberg atoms are of great interest due to their prospects in quantum information. Coherent control of the strong Rydberg-Rydberg interaction allows for the realization of quantum operations and devices which have been demonstrated in ultracold experiments. Since then, coherent dynamics to Rydberg states has been demonstrated also in thermal vapor cells on nanosecond timescales [1] and van der Waals interatomic interaction has been observed [2], where the interaction strength exceeds the energy scale of thermal motion and is thus strong enough to enable quantum correlations.

We present our progress on implementing a non-classical light source from a thermal vapor cell based on four-wave-mixing and Rydberg interaction.

We observe coherent dynamics within a thermal ensemble of Rydberg atoms in a pulsed four-wave-mixing scheme and effects of dephasing due to Rydberg-Rydberg interaction. Furthermore we discuss our recent work on the reduction of the excitation volume to below the Rydberg interaction range (few µ m) in 3 dimensions by use of high-NA optics and spatial confinement. First results of Rydberg four-wave-mixing therein will be shown.

[1] Huber et al., PRL 107, 243001 (2011)

[2] Baluktsian et al., PRL 110, 123001 (2013)