Fidelity spectrum : A tool to probe the property of a quantum phase

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

2 Scopus Citations
View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Article number030501
Journal / PublicationChinese Physics B
Volume25
Issue number3
Online published20 Jan 2016
Publication statusPublished - Mar 2016
Externally publishedYes

Abstract

Fidelity measures the similarity between two states and is widely adapted by the condensed matter community as a probe of quantum phase transitions in many-body systems. Despite its success in witnessing quantum critical points, information about the fine structure of a quantum phase one can get from this approach is still limited. Here, we proposed a scheme called fidelity spectrum. By studying the fidelity spectrum, one can obtain information about the characteristics of a phase. In particular, we investigated the spectra in the one-dimensional transverse-field Ising model and the two-dimensional Kitaev model on a honeycomb lattice. It was found that the spectra have qualitative differences in the critical and non-critical regions of the two models. From the distributions of them, the dominating k modes in a particular phase could also be captured.

Research Area(s)

  • quantized spin models, quantum information, Quantum phase transitions

Citation Format(s)

Fidelity spectrum: A tool to probe the property of a quantum phase. / Yu, Wing Chi; Gu, Shi-Jian.
In: Chinese Physics B, Vol. 25, No. 3, 030501, 03.2016.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review