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ReportsHanbury Brown Twiss Effect for Ultracold Quantum GasesWe 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.
1 Laboratoire Charles Fabry de l'Institut d'Optique, UMR 8501 du CNRS, Centre Scientifique d'Orsay, Bâtiment 503, 91403 Orsay CEDEX, France. * To whom correspondence should be addressed. E-mail: christoph.westbrook{at}iota.u-psud.fr
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Science. ISSN 0036-8075 (print), 1095-9203 (online)