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Coherent control of dense Rydberg gases

June 11, 2012 - 12:30pm
Speaker: 
Tilman Pfau
Institution: 
Universität Stuttgart

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]. When leaving the frozen gas regime the admixture of Rydberg states to the ground state atoms in a quantum gas can change the character of their mutual interaction [3]. We report first evidence for this Rydberg dressing. Finally we report on our effort to realize mesoscopic quantum ensembles based on thermal microscopic vapour cells [4].

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] J. Honer, H. Weimer, T. Pfau, and H. P. Büchler, Phys. Rev. Lett. 105, 160404 (2010).
[4] H. Kübler, J. P. Shaffer, T. Baluktsian, R. Löw, and T. Pfau, Nature Photonics 4, 112 (2010). B. Huber, T. Baluktsian, M. Schlagmüller, A. Kölle, H. Kübler, R. Löw, T. Pfau, Phys. Rev. Lett. 107, 243001 (2011).

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