Uhlmann fidelity and fidelity susceptibility for integrable spin chains at finite temperature: exact results

Uhlmann fidelity and fidelity susceptibility for integrable spin chains at finite temperature: exact results

We derive the exact expression for the Uhlmann fidelity between arbitrary thermal Gibbs states of the quantum XY model in a transverse field with finite system size. Using it, we conduct a thorough analysis of the fidelity susceptibility of thermal states for the Ising model in a transverse field. W...

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Bibliographic Details
Main Authors: Michał Białończyk, Fernando Javier Gómez-Ruiz, Adolfo del Campo
Format: Article
Language:English
Published: IOP Publishing 2021-01-01
Series:New Journal of Physics
Subjects:
quantum phase transitions
Uhlmann fidelity
fidelity susceptibility
Ising model
XY model
integrable spin chains
Online Access:https://doi.org/10.1088/1367-2630/ac23f0

Internet

https://doi.org/10.1088/1367-2630/ac23f0

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