计算了一维XY海森堡模型的基态纠缠度并作相关分析,为量子通信和量子计算提供启示性信息.将von Neumann熵定义的纠缠度与模型的基态本征矢建立联系计算出该模型体系的基态纠缠度.计算结果表明,(1)总格点数N相同,自旋向上电子数k增加时,基态纠缠度η增加;k相同,N增加时,η减小,真实反映了此模型的关联性.(2)N为偶数,位型[N,N/2]时,η=1,体现了自旋链格点中自旋向上和向下的电子数呈严格的对称性.(3)模型参数不同, η有別.(4)η在整个参数变化区间内的导率一致,体系为有纠缠的连续长程相,属于从有序到有序的相变.
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