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Thomas Pohl

Antiblockade in Rydberg excitation of an ultracold lattice gas

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  • C. Ates
  • ,
  • T. Pohl
  • T Pattard
  • ,
  • J. M. Rost

It is shown that the two-step excitation scheme typically used to create an ultracold Rydberg gas can be described with an effective two-level rate equation, greatly reducing the complexity of the optical Bloch equations. This allows us to efficiently solve the many-body problem of interacting cold atoms with a Monte Carlo technique. Our results reproduce the observed excitation blockade effect. However, we demonstrate that an Autler-Townes double peak structure in the two-step excitation scheme, which occurs for moderate pulse lengths as used in the experiment, can give rise to an antiblockade effect. It is most pronounced for atoms arranged on a lattice. Since the effect is robust against a large number of lattice defects it should be experimentally realizable with an optical lattice created by CO2 lasers.

Original languageEnglish
Article number023002
JournalPhysical Review Letters
Volume98
Issue2
Number of pages4
ISSN0031-9007
DOIs
Publication statusPublished - 12 Jan 2007

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