| 自旋为1的海森堡XXZ链两体纠缠 |
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| 引用本文： | 秦猛,陶应娟,胡明亮,田东平.自旋为1的海森堡XXZ链两体纠缠[J].量子电子学报,2008,25(3):302-306. |
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| 作者姓名： | 秦猛 陶应娟 胡明亮 田东平 |
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| 作者单位： | 1. 西安交通大学理学院,陕西西安,710049
2. 西安邮电学院,陕西西安,710061 |
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| 摘 要： | 采用Negativity理论研究了匀强磁场下自旋为1的海森堡XXZ链的纠缠特性,结果发现,两粒子情形下磁场的存在能明显的降低纠缠,但磁场并不改变纠缠为零时的临界温度,临界温度随着各向异性参数的增加而增加.而且纠缠伴随各向异性参量的变化是一个先增加后减小的过程.研究表明多粒子情况下,不同粒子数的纠缠都伴随△有较大的起伏:并且起初临界温度随着粒子数目的增加而降低,但是随着粒子数的进一步增加,纠缠的临界温度趋于相同.
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| 关 键 词： | 量子信息 两体热纠缠 Negativity理论 海森堡XXZ链 |
| 收稿时间： | 2007/5/11 |
Entanglement in spin-1 Heisenberg XXZ chain |
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| QIN Meng,TAO Ying-juan,HU Ming-liang,TIAN Dong-ping.Entanglement in spin-1 Heisenberg XXZ chain[J].Chinese Journal of Quantum Electronics,2008,25(3):302-306. |
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| Authors: | QIN Meng TAO Ying-juan HU Ming-liang TIAN Dong-ping |
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| Affiliation: | QIN Meng TAO Ying-juan HU Ming-liang TIAN Dong-ping 1 School of Science,Xi\'an Jiaotong University,Xi\'an 710049,China,2 Xi\'an Institute of Post , Telecommunications,Xi\'an 710061 |
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| Abstract: | The thermal entanglement of spin-1 XXZ-type Heisenberg chains in the presence of a uniform magnetic field along z axes is investigated by means of negativity theory.The existence of magnetic fields can obviously reduce the entanglement,and it is found that the critical temperature depends on the anisotropic parameter A but not on the uniform magnetic field.The results show that the increase of the qutrit results in the decrease of the critical temperature.In addition,the critical temperature is independent ... |
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| Keywords: | quantum information bipartite thermal entanglement negativity theory Heisenberg XXZ chain |
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