Bipartite entanglement in a two-qubit Heisenberg XXZ chain under an inhomogeneous magnetic field  

作　　者：秦猛 田东平 

机构地区：[1]Institute of Science, PLA University of Science and Technology [2]Xi'an Institute of Post and Telecommunications

出　　处：《Chinese Physics C》2009年第4期249-251,共3页中国物理C（英文版）

摘　　要：This paper investigates the bipartite entanglement of a two-qubit Heisenberg XXZ chain under an inhomogeneous magnetic field. By the concept of negativity, we find that the inhomogeneity of the magnetic field may induce entanglement and the critical magnetic field is independent of Jz. We also find that the entanglement is symmetric with respect to a zero magnetic field. The anisotropy parameter Jz may enhance the entanglement.This paper investigates the bipartite entanglement of a two-qubit Heisenberg XXZ chain under an inhomogeneous magnetic field. By the concept of negativity, we find that the inhomogeneity of the magnetic field may induce entanglement and the critical magnetic field is independent of Jz. We also find that the entanglement is symmetric with respect to a zero magnetic field. The anisotropy parameter Jz may enhance the entanglement.

关 键 词：bipartite entanglement NEGATIVITY Heisenberg XXZ chain 

分 类 号：O413.1[理学—理论物理] TP211.53[理学—物理]