| 磁场作用下XXZ模型的热力学纠缠 |
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| 引用本文： | 陈伟.磁场作用下XXZ模型的热力学纠缠[J].量子电子学报,2008,25(2):177-180. |
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| 作者姓名： | 陈伟 |
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| 作者单位： | 南京邮电大学应用技术学院,江苏,南京,210003 |
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| 基金项目： | 南京邮电大学青蓝计划基金 |
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| 摘 要： | 研究了一维带有外磁场的2量子比特XXZ模型的纠缠,得出它的纠缠度热力学解析表达式.通过计算表明,纠缠度在一定温度下随磁场各向异性参数的变化而展现的不同行为,发现系统纠缠对外磁场各项异性参数的变化非常敏感.当各向异性参数(△)固定时,纠缠关于磁场是对称分布;当各向异性参数(△)变大,纠缠很快地趋于零.此外,温度的变化对纠缠也有一定的影响.温度升高,系统纠缠的峰值不断减少,系统纠缠将完全消失.
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| 关 键 词： | 量子光学 XXZ模型 热力学纠缠 纠缠度 |
| 文章编号： | 1007-5461(2008)02-0177-04 |
| 收稿时间： | 2007/3/27 |
| 修稿时间： | 2007年3月27日 |
Thermal entanglement of XXZ model under magnetic field |
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| CHEN Wei.Thermal entanglement of XXZ model under magnetic field[J].Chinese Journal of Quantum Electronics,2008,25(2):177-180. |
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| Authors: | CHEN Wei |
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| Affiliation: | CHEN Wei (Department of Applied Technology,Nanjing University of Posts , Telecommunications Nanjing 210003 China) |
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| Abstract: | The analytical express of thermal concurrence is obtained by studying one dimension two-qubit XXZ model with magnetic field. It shows that concurrence has different behaviors as anisotropy parameters vary at certain temperature,and entanglement of the system is sensitive to the variety of anisotropy parameter of external magnetic field. When anisotropy parameter(Δ)is fixed,the concurrence is symmetrically distributed in the magnetic field. When the anisotropy parameter(Δ)is increasing,the concurrence tends to zero quickly. Meanwhile the variety of temperature has some effects on entanglement. As the temperature increases,the peak value of system entanglement reduces unceasingly,and the entanglement will completely vanish. |
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| Keywords: | quantum optics XXZ model thermal entanglement concurrence |
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