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Erschienen in: Quantum Information Processing 4/2017

01.04.2017

Quantum criticality from Fisher information

verfasst von: Hongting Song, Shunlong Luo, Shuangshuang Fu

Erschienen in: Quantum Information Processing | Ausgabe 4/2017

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Abstract

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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Metadaten
Titel
Quantum criticality from Fisher information
verfasst von
Hongting Song
Shunlong Luo
Shuangshuang Fu
Publikationsdatum
01.04.2017
Verlag
Springer US
Erschienen in
Quantum Information Processing / Ausgabe 4/2017
Print ISSN: 1570-0755
Elektronische ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-017-1543-9

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