Probing Berezinskii–Kosterlitz–Thouless Phase Transition of Spin-Half XXZ Chain by Quantum Fisher Information
Probing Berezinskii–Kosterlitz–Thouless Phase Transition of Spin-Half XXZ Chain by Quantum Fisher Information
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DOI：
10.1088/0253-6102/63/3/279
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发表时间：
2015-03
影响因子：
3.1
通讯作者：
Zheng Qiang;Yao Yao-Yao;Xun-Wei Xu
中科院分区：
文献类型：
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作者：
Zheng Qiang;Yao Yao-Yao;Xun-Wei Xu
利用量子费希尔信息重新研究了自旋 1/2 XXZ 链的 Berezinskii-Kosterlitz-Thouless 相变。整个N位点和部分N/3位点的量子Fisher信息在临界点附近表现出非常相似的行为。得到量子Fisher信息的临界指数为β=0.47，这与并发和量子不和谐得到的结果一致。
The Berezinskii–Kosterlitz–Thouless phase transition of spin-1/2 XXZ chain is reinvestigated by the quantum Fisher information. Quantum Fisher informations of the whole N sites and the partial N/3 sites display remarkably similar behaviors near the critical point. The critical exponent of quantum Fisher information is obtained as β = 0.47, which is consistent with the results obtained by the concurrence and quantum discord.