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Article Dans Une Revue Physical Review Letters Année : 2010

Probing three-body correlations in a quantum gas using the measurement of the third moment of density fluctuations

Résumé

We perform measurements of the third moment of atom number fluctuations in small slices of a very elongated weakly interacting degenerate Bose gas. We find a positive skewness of the atom number distribution in the ideal gas regime and a reduced skewness compatible with zero in the quasi-condensate regime. For our parameters, the third moment is a thermodynamic quantity whose measurement constitutes a sensitive test of the equation of state and our results are in agreement with a modified Yang-Yang thermodynamic prediction. Moreover, we show that the measured skewness reveals the presence of true three body correlations in the system.
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Dates et versions

hal-00504642 , version 1 (20-07-2010)
hal-00504642 , version 2 (21-07-2010)
hal-00504642 , version 3 (08-12-2010)

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Julien Armijo, Thibaut Jacqmin, Karen Kheruntsyan, Isabelle Bouchoule. Probing three-body correlations in a quantum gas using the measurement of the third moment of density fluctuations. Physical Review Letters, 2010, 105, pp.230402. ⟨hal-00504642v3⟩
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