Thermal Entanglement of a Three-Qubit Heisenberg Chain with a Nonuniform Magnetic Field

作     者：YANG Guo-Hui ZHOU Ling 

作者机构：School of Physics and Optoelectronic Technology Dalian University of Technology Dalian 116023 China 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2008年第49卷第6期

页      面：1635-1638页

核心收录：

学科分类：080805[工学-电工理论与新技术] 080904[工学-电磁场与微波技术] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：the Natural Science Foundation of Liaoning Province under Grant No.20031073 

主　　题：Heisenberg model entanglement nonuniform magnetic field 

摘      要：The thermal entanglement of a three-qubit Heisenberg chain under a nonuniform magnetic field is studied. It is very interesting to note that the next nearest neighbor entanglement （NNNE） could be larger than the nearest neighbor entanglement （NNE）. We analyze the ground state entanglement, and give the conditions that NNNE is larger than NNE near zero temperature. Our results also show that the nonuniform field could induce the entanglement and improve the threshold temperature at certain parameter region.