Hanbury Brown Twiss Effect for Ultracold Quantum Gases

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Science  28 Oct 2005:
Vol. 310, Issue 5748, pp. 648-651
DOI: 10.1126/science.1118024

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We have studied two-body correlations of atoms in an expanding cloud above and below the Bose-Einstein condensation threshold. The observed correlation function for a thermal cloud shows a bunching behavior, whereas the correlation is flat for a coherent sample. These quantum correlations are the atomic analog of the Hanbury Brown Twiss effect. We observed the effect in three dimensions and studied its dependence on cloud size.

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