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Chinese Physics, 2007, Vol. 16(3): 834-839    DOI: 10.1088/1009-1963/16/3/046
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Energy spectrum and entanglement of two tunnel- coupled Bose--Einstein condensates

Cheng Rong(程茸) and Liang Jiu-Qing(梁九卿)
Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China
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.
Keywords:  energy spectrum      entanglement      Bose--Einstein condensates  
Received:  26 September 2005      Revised:  04 November 2005      Accepted manuscript online: 
PACS:  03.75.Gg (Entanglement and decoherence in Bose-Einstein condensates)  
  03.65.Xp (Tunneling, traversal time, quantum Zeno dynamics)  
  03.75.Lm (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)  
Fund: Project supported by National Natural Science Foundation of China (Grant No 10475053).

Cite this article: 

Cheng Rong(程茸) and Liang Jiu-Qing(梁九卿) Energy spectrum and entanglement of two tunnel- coupled Bose--Einstein condensates 2007 Chinese Physics 16 834

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