Partial-state fidelity and quantum phase transitions induced by continuous level crossing

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dc.creatorKwok, Ho-Man
dc.creatorHo, Chun-Sing
dc.creatorGu, Shi-Jian
dc.date2008-05-26
dc.date2008-05-28
dc.date.accessioned2026-07-07T12:10:33Z
dc.date.available2026-07-07T12:10:33Z
dc.descriptionThe global-state fidelity cannot characterize those quantum phase transitions (QPTs) induced by continuous level crossing due to its collapse around each crossing point. In this paper, we take the isotropic Lipkin-Meshkov-Glick (LMG) model and the antiferromagnetic one-dimensional Heisenberg model as examples to show that the partial-state fidelity can signal such level-crossing QPTs. Extending to the thermodynamic limit we introduce the partial-state fidelity susceptibility and study its scaling behavior. The maximum of the partial-state fidelity susceptibility goes like $N$ for the LMG model and $N^3$ for the Heisenberg model.
dc.description5 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0805.3885
dc.identifierhttp://arxiv.org/abs/0805.3885
dc.identifierPhys. Rev. A 78, 062302 (2008)
dc.identifierdoi:10.1103/PhysRevA.78.062302
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/209963
dc.subjectQuantum Physics
dc.titlePartial-state fidelity and quantum phase transitions induced by continuous level crossing
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