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题名: Mixed-state fidelity and quantum criticality at finite temperature
作者: Zanardi, Paolo ;  Quan, H. T. ;  Wang, Xiaoguang ;  Sun, C. P.
刊名: PHYSICAL REVIEW A
出版日期: 2007
卷号: 75, 期号:3, 页码:-
关键词: ENTANGLEMENT
学科分类: Physics
通讯作者: Zanardi, P , Inst Sci Interchange, Villa Gualino,Viale Severo 65, I-10133 Turin, Italy
部门归属: Inst Sci Interchange, I-10133 Turin, Italy; Univ So Calif, Dept Phys & Astron, Los Angeles, CA 90089 USA; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Zhejiang Univ, Inst Modern Phys, Dept Phys, Hangzhou 310027, Peoples R China
英文摘要: We extend to finite temperature the fidelity approach to quantum phase transitions (QPTs). This is done by resorting to the notion of mixed-state fidelity that allows one to compare two density matrices corresponding to two different thermal states. By exploiting the same concept we also propose a finite-temperature generalization of the Loschmidt echo. Explicit analytical expressions of these quantities are given for a class of quasifree fermionic Hamiltonians. A numerical analysis is performed as well showing that the associated QPTs show their signatures in a finite range of temperatures.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000245326300026
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5777
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Zanardi, Paolo,Quan, H. T.,Wang, Xiaoguang,et al. Mixed-state fidelity and quantum criticality at finite temperature[J]. PHYSICAL REVIEW A,2007,75(3):-.
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