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Thomas Pohl

Rydberg-blockade effects in Autler-Townes spectra of ultracold strontium

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  • B. J. DeSalvo, Rice University
  • ,
  • J. A. Aman, Rice University
  • ,
  • C. Gaul
  • ,
  • T. Pohl
  • S. Yoshida, Vienna University of Technology, Vienna
  • ,
  • J. Burgdörfer, Vienna University of Technology, Vienna
  • ,
  • K. R. A. Hazzard, Rice University
  • ,
  • F.B. Dunning, Rice University
  • ,
  • T. C. Killian, Rice University

We present a combined experimental and theoretical study of the effects of Rydberg interactions on Autler-Townes spectra of ultracold gases of atomic strontium. Realizing two-photon Rydberg excitation via a long-lived triplet state allows us to probe the regime where Rydberg state decay presents the dominant decoherence mechanism. The effects of Rydberg interactions are observed in shifts, asymmetries, and broadening of the measured atom-loss spectra. The experiment is analyzed within a one-body density-matrix approach, accounting for interaction-induced level shifts and dephasing through nonlinear terms that approximately incorporate correlations due to the Rydberg blockade. This description yields good agreement with our experimental observations for short excitation times. For longer excitation times, the loss spectrum is altered qualitatively, suggesting additional dephasing mechanisms beyond the standard blockade mechanism based on pure van der Waals interactions.

Original languageEnglish
Article number022709
JournalPhysical Review A
Number of pages10
Publication statusPublished - 22 Feb 2016
Externally publishedYes

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