Energy spectrum and entanglement of two tunnel- coupled Bose--Einstein condensates |
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Authors: | Cheng Rong and Liang Jiu-Qing |
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Institution: | Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China |
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Abstract: | This paper obtains the energy-spectrum and eigenstate corrections of
two-mode Bose--Einstein condensates (BECs) coupled by quantum
tunnelling
by perturbation method in both strong and weak tunnelling
regions. The population imbalance between two BECs are then studied
in terms of the low-lying eigenstates which also characterize the
intrinsic entanglement between the two-mode BECs. The strong parity
effect in the weak tunnelling region is also investigated. |
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Keywords: | energy spectrum entanglement Bose--Einstein condensates |
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