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arXiv · 1007.3713

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

Julien Armijo·Thibaut Jacqmin·Karen Kheruntsyan·Isabelle Bouchoule
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Abstract

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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Julien Armijo, Thibaut Jacqmin, Karen Kheruntsyan, Isabelle Bouchoule. 2010-12-08. Probing three-body correlations in a quantum gas using the measurement of the third moment of density fluctuations. https://doi.org/10.1103/physrevlett.105.230402

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