Entanglement in quantum critical phenomena
Entanglement in quantum critical phenomena
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DOI：
10.1103/physrevlett.90.227902
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发表时间：
2003-06-06
影响因子：
8.6
通讯作者：
Kitaev, A
中科院分区：
文献类型：
--
作者：
Vidal, G;Latorre, JI;Kitaev, A
纠缠是量子理论最有趣的特征之一，也是量子信息科学的主要资源，预计在量子相变的研究中也将发挥关键作用，因为它是长程相关的出现。通过微观计算，研究了自旋链系统中量子临界点附近和临界点处纠缠的标度性质。我们的结果建立了量子信息，凝聚态物理学和量子场论的概念之间的精确连接，通过显示临界纠缠在自旋系统中的行为是类似于共形场论中的熵。我们探讨了这种联系的一些含义。
Entanglement, one of the most intriguing features of quantum theory and a main resource in quantum information science, is expected to play a crucial role also in the study of quantum phase transitions, where it is responsible for the appearance of long-range correlations. We investigate, through a microscopic calculation, the scaling properties of entanglement in spin chain systems, both near and at a quantum critical point. Our results establish a precise connection between concepts of quantum information, condensed matter physics, and quantum field theory, by showing that the behavior of critical entanglement in spin systems is analogous to that of entropy in conformal field theories. We explore some of the implications of this connection.