中国物理B ›› 2009, Vol. 18 ›› Issue (4): 1338-1341.doi: 10.1088/1674-1056/18/4/008

• GENERAL • 上一篇    下一篇

Bipartite entanglement of a two-qubit system with anisotropic couplings under nonuniform magnetic fields

秦猛1, 田东平2   

  1. (1)Institute of Science, PLA University of Science and Technology, NanJing 211101, China; (2)Xi'an Institute of Post and Telecommunications, Xi'an 710061, China
  • 收稿日期:2008-08-04 修回日期:2008-09-15 出版日期:2009-04-20 发布日期:2009-04-20

Bipartite entanglement of a two-qubit system with anisotropic couplings under nonuniform magnetic fields

Qin Meng(秦猛)a)† and Tian Dong-Ping(田东平)b)   

  1. a Institute of Science, PLA University of Science and Technology, NanJing 211101, China; b Xi'an Institute of Post and Telecommunications, Xi'an 710061, China
  • Received:2008-08-04 Revised:2008-09-15 Online:2009-04-20 Published:2009-04-20

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摘要： This paper investigates bipartite entanglement of a two-qubit system with anisotropic couplings under an inhomogeneous magnetic field. This work is mainly to investigate the characteristics of a Heisenberg XYZ chain and obtains some meaningful results. By the concept of negativity, it finds that the inhomogeneity of magnetic field may induce entanglement and the critical magnetic field is independent of Jz. The inhomogeneous magnetic field can increase the value of critical magnetic field Bc. It also finds that the magnetic field not only suppresses the entanglement but also can induce it to revival for some time.

Abstract: This paper investigates bipartite entanglement of a two-qubit system with anisotropic couplings under an inhomogeneous magnetic field. This work is mainly to investigate the characteristics of a Heisenberg XYZ chain and obtains some meaningful results. By the concept of negativity, it finds that the inhomogeneity of magnetic field may induce entanglement and the critical magnetic field is independent of Jz. The inhomogeneous magnetic field can increase the value of critical magnetic field Bc. It also finds that the magnetic field not only suppresses the entanglement but also can induce it to revival for some time.

Key words: Heisenberg XYZ chain, bipartite entanglement, negativity

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.Lx (Quantum computation architectures and implementations) 75.10.Jm (Quantized spin models, including quantum spin frustration)