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|Title:||Fidelity for the quantum evolution of a Bose-Einstein condensate|
|Authors:||Liu, J. |
|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|
|Appears in Collections:||Staff Publications|
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