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

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

2010-07-21

arxiv.org/abs/1007.3713v3

Physical Review Letters 105 (2010) 230402

Physics

Condensed Matter

Quantum Gases

Scientific paper

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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