Number squeezing, quantum fluctuations and oscillations in mesoscopic Bose Josephson junctions

Details Number squeezing, quantum fluctuations and oscillations in mesoscopic Bose Josephson junctions Number squeezing, quantum fluctuations and oscillations in mesoscopic Bose Josephson junctions

2008-01-21

arxiv.org/abs/0801.3154v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.78.023606

Starting from a quantum two-mode Bose-Hubbard Hamiltonian we determine the ground state properties, momentum distribution and dynamical evolution for a Bose Josephson junction realized by an ultracold Bose gas in a double-well trap. Varying the well asymmetry we identify Mott-like regions of parameters where number fluctuations are suppressed and the interference fringes in the momentum distribution are strongly reduced. We also show how Schroedinger cat states, realized from an initially phase coherent state by a sudden rise of the barrier among the two wells, will give rise to a destructive interference in the time-dependent momentum distribution.

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