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(Δ)固定时,纠缠关于磁场是对称分布;当各向异性参数(Δ)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.
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 （△） is fixed, the concurrence is symmetrically distributed in the magnetic field. When the anisotropy parameter （△） 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
出处
《量子电子学报》
CAS
CSCD
北大核心
2008年第2期177-180,共4页
Chinese Journal of Quantum Electronics
基金
南京邮电大学"青蓝计划"基金项目(NY206048)资助
