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Chinese Physics, 2007, Vol. 16(11): 3396-3401    DOI: 10.1088/1009-1963/16/11/042

Entanglement between two atoms in the system of Schrödinger cat state interacting with two entangled atoms

Liu Tang-Kun(刘堂昆)
Hubei Province Key Laboratory of Bioanalytical Technique (Hubei Normal University), Department of Physics, Hubei Normal University, Huangshi 435002, China
Abstract  By the negative eigenvalues of partial transposition of density matrix, this paper investigates the time evolution of entanglement of the two entangled atoms in the system of two atoms interacting with Schr?dinger cat state. The result shows that the two atoms are always in the entanglement state, and the degree of entanglement between the two atoms exhibits ordinary collapses and revivals at 0.2 degree of entanglement, when the light field is large enough. On the other hand, the reinforcement of three different light fields on the degree of entanglement between two atoms is not evident.  
Keywords:  negative eigenvalues      entanglement state      Schr?dinger cat state  
Accepted manuscript online: 
PACS:  03.65.Ge (Solutions of wave equations: bound states)  
  03.65.Fd (Algebraic methods)  
  03.65.Ta (Foundations of quantum mechanics; measurement theory)  
  03.65.Ud (Entanglement and quantum nonlocality)  
  42.50.Dv (Quantum state engineering and measurements)  

Cite this article: 

Liu Tang-Kun(刘堂昆) Entanglement between two atoms in the system of Schrödinger cat state interacting with two entangled atoms 2007 Chinese Physics 16 3396

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