In this paper, by employing Bogliubov backreaction method, we investigate quantum correction effects on dynamical phase transition in a single species bosonic Josephson junction induced by increasing nonlinear interaction. Compared with mean field theory results, we find that the transition point is shifted. The dynamical phase transition is accompanied by a change of the entanglement entropy, which is found to reach a maximum at the transition point of the mean field theory.

Communications in Theoretical PhysicsAug 1, 20132 citations

The European Physical Journal B

Mean-field theories for the quantum phase transition in Josephson junction arrays

J. G. Kissner, Ulrich Eckern

Published Jun 1, 1993• 15 citations

Publisher

DOI: 10.1007/bf01315230

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{N}^{2},

suggestive of coherent emission. These features remain even when the junction parameters have some random variation from junction to junction, as expected in a real array. Both of these features agree with recent experiments by Barbara and co-workers.