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Quantum correlation approach to criticality in the XX spin chain with multiple interaction

机译:具有多重相互作用的XX自旋链中临界度的量子相关方法

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摘要

We investigate the quantum critical behavior in the XX spin chain with a XZY-YZX type multiple interaction by means of quantum correlation (Concurrence C, quantum discord ~(DQ) and geometric discord ~(DG)). Around the critical point, the values of these quantum correlations and corresponding derivatives are investigated numerically and analytically. The results show that the non-analyticity property of the concurrence cannot signal well the quantum phase transition, but both the quantum discord and geometric discord can characterize the critical behavior in such model exactly.
机译:我们通过量子相关性(并发C,量子不和谐〜(DQ)和几何不和谐〜(DG))研究了XZY-YZX型多重相互作用的XX自旋链中的量子临界行为。在临界点附近,对这些量子相关值和相应的导数进行了数值和分析研究。结果表明,并发的非解析性不能很好地表示量子相变,但是量子不和和几何不和都可以准确地描述这种模型中的临界行为。

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