Quantum criticality from Fisher information

被引：0
作者：
Hongting Song
Shunlong Luo
Shuangshuang Fu
机构：
[1] China Academy of Space Technology,Qian Xuesen Laboratory of Space Technology
[2] Chinese Academy of Sciences,Academy of Mathematics and Systems Science
[3] University of Science and Technology Beijing,School of Mathematics and Physics
来源：
Quantum Information Processing | 2017年 / 16卷
关键词：
Quantum criticality; Quantum phase transition; Quantum Fisher information; Quantum metrology;
D O I：
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中图分类号：
学科分类号：
摘要：
Quantum phase transition is primarily characterized by a qualitative sudden change in the ground state of a quantum system when an external or internal parameter of the Hamiltonian is continuously varied. Investigating quantum criticality using information-theoretic methods has generated fruitful results. Quantum correlations and fidelity have been exploited to characterize the quantum critical phenomena. In this work, we employ quantum Fisher information to study quantum criticality. The singular or extremal point of the quantum Fisher information is adopted as the estimated thermal critical point. By a significant model constructed in Quan et al. (Phys Rev Lett 96: 140604, 2006), the effectiveness of this method is illustrated explicitly.
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