| 含杂质三量子位Heisenberg XXX链的全局两体纠缠 |
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| 引用本文： | 陶应娟,胡明亮,田东平,秦猛.含杂质三量子位Heisenberg XXX链的全局两体纠缠[J].中国物理 C,2007,31(10):990-994. |
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| 作者姓名： | 陶应娟 胡明亮 田东平 秦猛 |
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| 作者单位： | 西安交通大学理学院，西安交通大学理学院，西安邮电学院，西安交通大学理学院 西安 710049，西安 710049，西安 710061，西安 710049 |
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| 摘 要： | 研究了含杂质三量子位Heisenberg XXX链的全局两体纠缠, 通过计算N12-3和N1-23, 发现两体纠缠存在的临界温度Tc随杂质参数J1的增加而升高. 给定温度T, 相应的纠缠存在的临界杂质
参数J1c随磁场的增加而增加, 而且可以通过调节杂质参数J1和磁场B来控制N12-3和N1-23的取值. 此外, 随着温度的增加, N12-3的最大值将由0.5减小到0.3727, 而N1-23的最大值保持0.4714不变.
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| 关 键 词： | Heisenberg XXX链 全局两体纠缠 杂质 |
| 收稿时间： | 2006-11-14 |
| 修稿时间： | 2006-11-14 |
Global Bipartite Entanglement in the Three-Qubit Heisenberg XXX Spin Chain with Impurity |
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| TAO Ying-Juan,HU Ming-Liang,TIAN Dong-Ping,QIN Meng.Global Bipartite Entanglement in the Three-Qubit Heisenberg XXX Spin Chain with Impurity[J].High Energy Physics and Nuclear Physics,2007,31(10):990-994. |
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| Authors: | TAO Ying-Juan HU Ming-Liang TIAN Dong-Ping QIN Meng |
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| Abstract: | We study the global bipartite entanglement of the three-qubit Heisenberg XXX spin chain with impurity.Through calculating the negativities N_(1-23)and N_(12-3),we show that the critical temperature T_c above which the entanglement vanishes increases with the increase of the impurity parameter J1.For a given T,the corresponding critical impurity parameterJ_(1c)below which the entanglement vanishes increases with the increase of the magnetic field B,and by adjusting J_1 and B one can control the values of N_(1-23)and N_(12-3). The maximum value of N_(12-3)decreases from 0.5 to 0.3727 as the temperature rises,but the one of N_(1-23)keeps the constant value of about 0.4714. |
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| Keywords: | Heisenberg XXX chain global bipartite entanglement impurity |
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