Probing Three-Body Correlations in a Quantum Gas Using the Measurement of the Third Moment of Density Fluctuations

2010/07/31 by Julien Armijo, T. Jacqmin, Thibaut Jacqmin +3 · 126 citations
Mathematics · Physics and Astronomy · #Atom (system on chip) #Bose gas #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Degenerate energy levels #Fermi gas #Ideal gas #Mathematics #Moment (physics) #Physics #Quantum many-body systems #Quantum mechanics #Quantum, superfluid, helium dynamics #Skewness #Statistical physics #Statistics #cond-mat.quant-gas

paper · pdf · doi:10.1103/physrevlett.105.230402

published in Physical Review Letters 105(23), 230402 (American Physical Society)

openalex publication_date 2010/11/30 · arxiv created 2010/12/08 · arxiv updated 2015/05/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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 quasicondensate 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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