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Generalized mutual information of quantum critical chains

机译:量子临界链的广义互信息

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摘要

We study the generalized mutual information I_n of the ground state of different critical quantum chains. The generalized mutual information definition that we use is based on the well established concept of the Renyi divergence. We calculate this quantity numerically for several distinct quantum chains having either discrete Z(Q) symmetries (Q-state Potts model with Q = 2,3,4 and Z(Q) parafermionic models with Q = 5,6,7,8 and also Ashkin-Teller model with different anisotropies) or the U(1) continuous symmetries (Klein-Gordon field theory, XXZ and spin-1 Fateev-Zamolodchikov quantum chains with different anisotropies). For the spin chains these calculations were done by expressing the ground-state wave functions in two special bases. Our results indicate some general behavior for particular ranges of values of the parameter n that defines I_n. For a system, with total size L and subsystem sizes ℓ and L - ℓ, the I_n has a logarithmic leading behavior given by c_n/4 log[L/π sin(πℓ/L)] where the coefficient c_n is linearly dependent on the central charge c of the underlying conformal field theory describing the system's critical properties.
机译:我们研究了不同临界量子链的基态的广义互信息I_n。我们使用的通用互信息定义基于公认的仁义散度概念。我们对具有离散的Z(Q)对称性的几个不同的量子链(在Q = 2,3,4的Q状态Potts模型和Q = 5,6,7,8的Z(Q)超铁离子模型以及还具有不同各向异性的Ashkin-Teller模型)或U(1)连续对称性(Klein-Gordon场论,XXZ和自旋1 Fateev-Zamolodchikov量子链具有不同的各向异性)。对于自旋链,这些计算是通过在两个特殊基数中表示基态波函数来完成的。我们的结果表明,对于定义I_n的参数n的特定值范围,存在一些一般行为。对于总大小为L且子系统大小为ℓ和L-ℓ的系统,I_n具有对数超前行为,由c_n / 4 log [L /πsin(πℓ/ L)]给出,其中系数c_n线性依赖于基本共形场理论的中心电荷c,描述了系统的关键特性。

著录项

  • 来源
    《Physical review》 |2015年第15期|155122.1-155122.10|共10页
  • 作者

    F. C. Alcaraz; M. A. Rajabpour;

  • 作者单位

    Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, Caixa Postal 369, 13560-970, Sao Carlos, SP, Brazil;

    Instituto de Fisica, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza s, Gragoata, 24210-346, Niteroi, RJ, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    conformal field theory, algebraic structures; spin chain models;

    机译:共形场论;代数结构;自旋链模型;

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