Sub-Poissonian fluctuations in a 1D Bose gas: from the quantum quasi-condensate to the strongly interacting regime

Abstract

We report on local measurements of atom number fluctuations in slices of a single 1D Bose gas with repulsive interactions. For weakly interacting gases, the fluctuations are super-Poissonian at intermediate atomic densities and become sub-Poissonian at high densities once the gas enters into the quantum quasi-condensate regime. At stronger interactions, when approaching the fermionization regime, we no longer observe super-Poissonian statistics; the fluctuations go from Poissonian to sub-Poissonian as the density is increased, as those in a Fermi gas.

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• Probing the Superfluid to Mott Insulator Transition at the Single Atom Level
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• Speckle Imaging of Spin Fluctuations in a Strongly Interacting Fermi Gas
• Sub-Poissonian number differences in four-wave mixing of matter waves
• Extended Coherence Time with Atom-Number Squeezed Sources
• Non-local pair correlations in the 1D Bose gas at finite temperature
• Direct observation of number squeezing in an optical lattice
• Hydrodynamic modes of a 1D trapped Bose gas
• Sub-Poissonian atom number fluctuations by three-body loss in mesoscopic ensembles
• Limitation of the modulation method to smooth wire guide roughness

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