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We discuss various aspects of coherence of a Bose-Einstein condensate, and summarize the experimental evidence obtained thus far. It is shown that the mean-field energy of a condensate is a measure of second-order coherence. ``Release-energy'' measurements therefore provide direct evidence of the suppression of density fluctuations in a condensate compared to a thermal cloud.
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Ketterle et al. (1997) studied this question.
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