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

被引：95

作者：

Armijo, J. ^{[1
]}

Jacqmin, T. ^{[1
]}

Kheruntsyan, K. V. ^{[2
]}

Bouchoule, I. ^{[1
]}

机构：

[1] CNRS, Inst Opt, Lab Charles Fabry, UMR 8501, F-91127 Palaiseau, France

[2] Univ Queensland, Sch Math & Phys, ARC Ctr Excellence Quantum Atom Opt, Brisbane, Qld 4072, Australia

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 23期

基金：

澳大利亚研究理事会;

关键词：

THERMODYNAMICS;

D O I：

10.1103/PhysRevLett.105.230402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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