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Coherent control of dense Rydberg gases

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We report on coherent interaction effects involving Rydberg atoms in a dense gas. Their long-range strong interaction is responsible for novel many-body physics. Universal scaling behaviour due to an underlying quantum phase transition is observed [1]. Also the coherence properties of Förster resonances giving rise to resonant dipolar interactions were investigated using a pair state interferometer [2]. We also report on our recent observation of coherent control of Rydberg atoms and van der Waals interaction between Rydberg atoms in thermal vapor cells [3].

References [1] R. Löw, H. Weimer, U. Raitzsch, R. Heidemann, V. Bendkowsky, B. Butscher, H. P. Büchler, and T. Pfau, Phys. Rev. A 80 , 033422 (2009), H. Weimer, R. Löw, T. Pfau, and H. P. Büchler, Phys. Rev. Lett. 101 250601 (2008). [2] J. Nipper, J. B. Balewski, A. T. Krupp, B. Butscher, R. Löw, T. Pfau, Phys. Rev. Lett. 108, 113001 (2012), J. Nipper, J.B. Balewski, A.T. Krupp, S. Hofferberth, R. Löw, T. Pfau, accepted in Phys. Rev. X. [3] B. Huber, T. Baluktsian, M. Schlagmüller, A. Kölle, H. Kübler, R. Löw, T. Pfau, Phys. Rev. Lett. 107, 243001 (2011). T. Baluktsian, B. Huber, , R. Löw, T. Pfau, submitted for publication.

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