Quantum noise thermometry for bosonic Josephson junctions in the mean field regime

Details Quantum noise thermometry for bosonic Josephson junctions in the mean field regime Quantum noise thermometry for bosonic Josephson junctions in the mean field regime

2009-05-15

arxiv.org/abs/0905.2491v1

Physical Review A 79, 063601 (2009)

Physics

Atomic Physics

Accepted for Phys. Rev. A

Scientific paper

10.1103/PhysRevA.79.063601

Bosonic Josephson junctions can be realized by confining ultracold gases of bosons in multi-well traps, and studied theoretically with the $M$-site Bose-Hubbard model. We show that canonical equilibrium states of the $M$-site Bose-Hubbard model may be approximated by mixtures of coherent states, provided the number of atoms is large and the total energy is comparable to $k_BT$. Using this approximation, we study thermal fluctuations in bosonic Josephson junctions in the mean field regime. Statistical estimates of the fluctuations of relative phase and number, obtained by averaging over many replicates of an experiment, can be used to estimate the temperature and the tunneling parameter, or to test whether the experimental procedure is effectively sampling from a canonical thermal equilibrium ensemble.

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