Comment on “Exact Quantum Dynamics of a Bosonic Josephson Junction” Academic Article uri icon


  • Sakmann et al. challenge the two-mode Bose-Hubbard (TMBH) and Gross-Pitaevskii (GP) approximations for double-well Bose-Einstein condensates [1]. They find interesting deviations from the predictions of the TMBH model for dimensionless interaction parameter values as low as Λ≈ 1.5. Moreover, deviations from the GP approximation are obtained despite the validity of the 1D weak-interaction (1DWI) criterion. In this comment we clarify that the value of Λ by itself is not necesaarily relavant to the TMBH modelling validity question. The relevant dimensionless parameters of this problem are both ν and Λ (see definitions below). In the specific setup of [1], if the interaction strength is increased, both ν and Λ become larger, hance larger deviations are observed. Below we illuminate that Λ can be experimentally controlled independently of ν. Hence we conclude that the relevance of …

publication date

  • January 1, 1997