Sub-Poissonian fluctuations in a 1D Bose gas: from the quantum   quasi-condensate to the strongly interacting regime
  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. 
Thibaut Jacqmin (LCFIO), Julien Armijo (LCFIO), Tarik Berrada (LCFIO),   Karen Kheruntsyan, Isabelle Bouchoule (LCFIO)
cond-mat.quant-gas physics.atom-ph