Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevA.72.063623
Title: Fidelity for the quantum evolution of a Bose-Einstein condensate
Authors: Liu, J. 
Wang, W. 
Zhang, C.
Niu, Q.
Li, B. 
Issue Date: Dec-2005
Citation: Liu, J., Wang, W., Zhang, C., Niu, Q., Li, B. (2005-12). Fidelity for the quantum evolution of a Bose-Einstein condensate. Physical Review A - Atomic, Molecular, and Optical Physics 72 (6) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.72.063623
Abstract: We investigate fidelity for the quantum evolution of a Bose-Einstein condensate (BEC) and reveal its general property with a simple two-component BEC model. We find that, when the initial state is a coherent state, the fidelity decays with time in the ways of exponential, Gaussian, and power law, depending on the initial location, the perturbation strength, as well as the underlying mean-field classical dynamics. In this case we find a clear correspondence between the fast quantum fidelity decay and the dynamical instability of the mean-field system. With the initial state prepared as a maximally entangled state, we find that the behavior of fidelity has no classical correspondence and observe an interesting behavior of the fidelity: periodic revival, where the period is inversely proportional to the number of bosons and the perturbation strength. An experimental observation of the fidelity decay is suggested. © 2005 The American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/96624
ISSN: 10502947
DOI: 10.1103/PhysRevA.72.063623
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