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)
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
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.
Received: 04 August 2008
Revised: 15 September 2008
Accepted manuscript online:
(Quantized spin models, including quantum spin frustration)
Cite this article:
Qin Meng(秦猛) and Tian Dong-Ping(田东平) Bipartite entanglement of a two-qubit system with anisotropic couplings under nonuniform magnetic fields 2009 Chin. Phys. B 18 1338
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