Probing nonlocal spatial correlations in quantum gases with ultra-long-range Rydberg molecules

  title={Probing nonlocal spatial correlations in quantum gases with ultra-long-range Rydberg molecules},
  author={J. D. Whalen and S. K. Kanungo and R Ding and Marcel Wagner and Richard Schmidt and H. R. Sadeghpour and S. Yoshida and Joachim Burgdorfer and F. B. Dunning and Thomas C. Killian},
  journal={Physical Review A},
We present photo-excitation of ultra-long-range Rydberg molecules as a probe of spatial correlations in quantum gases. Rydberg molecules can be created with well-defined internuclear spacing, set by the radius of the outer lobe of the Rydberg electron wavefunction $R_n$. By varying the principal quantum number $n$ of the target Rydberg state, the molecular excitation rate can be used to map the pair-correlation function of the trapped gas $g^{(2)}(R_n)$. We demonstrate this with ultracold Sr… 

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