Evidence for coherent collective Rydberg excitation in the strong blockade regime

被引：291

作者：

Heidemann, Rolf

Raitzsch, Ulrich

Bendkowsky, Vera

Butscher, Bjoern

Loew, Robert

Santos, Luis

Pfau, Tilman

机构：

[1] Univ Stuttgart, Inst Phys, D-70569 Stuttgart, Germany

[2] Leibniz Univ Hannover, Inst Theoret Phys, D-30167 Hannover, Germany

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.99.163601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on strong van der Waals blockade in two-photon Rydberg excitation of ultracold magnetically trapped Rb-87 atoms. The excitation dynamics was investigated for a large range of densities and laser intensities and shows a full saturation and a strong suppression with respect to single-atom behavior. The observed scaling of the initial increase with density and laser intensity provides evidence for coherent collective excitation. This coherent collective behavior, that was observed for up to several thousand atoms per blockade volume, is generic for all mesoscopic systems which are able to carry only one single quantum of excitation.

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