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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