Observations of density fluctuations in an elongated Bose gas: ideal gas and quasi-condensate regimes

Abstract

We report in situ measurements of density fluctuations in a quasi one dimensional Bose gas at thermal equilibrium in an elongated harmonic trap. We observe an excess of fluctuations compared to the shot noise level expected for uncorrelated atoms. At low atomic density, the measured excess is in good agreement with the expected bunching for an ideal Bose gas. At high density, the measured fluctuations are strongly reduced compared to the ideal gas case. We attribute this reduction to repulsive interatomic interactions. The data are compared with a calculation for an interacting Bose gas in the quasi-condensate regime.

References in corpus (16)

• Probing many-body states of ultra-cold atoms via noise correlations
• Spatial quantum noise interferometry in expanding ultracold atom clouds
• Hanbury Brown Twiss effect for ultracold quantum gases
• Extension of Bogoliubov theory to quasi-condensates
• Probing Pair-Correlated Fermionic Atoms through Correlations in Atom Shot Noise
• Correlations and Counting Statistics of an Atom Laser
• Observation of Phase Fluctuations in Bose-Einstein Condensates
• Spatial coherence and density correlations of trapped Bose gases
• Pair correlations in a finite-temperature 1D Bose gas
• Momentum spectroscopy of 1D phase fluctuations in Bose-Einstein condensates
• Measurement of the Spatial Correlation Function of Phase Fluctuating Bose-Einstein Condensates
• Finite temperature correlations and density profiles of an inhomogeneous interacting 1D Bose gas
• Bose-Einstein condensation into non-equilibrium states studied by condensate focusing
• Quasi-1D Bose-Einstein condensates in the dimensional crossover regime
• Coherence length of an elongated condensate: a study by matter-wave interferometry
• Spatial Correlation Diagnostics for Atoms in Optical Lattices

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