Operator fidelity susceptibility: an indicator of quantum criticality
Quantum Physics
2009-11-13 v2
Abstract
We introduce the operator fidelity and propose to use its susceptibility for characterizing the sensitivity of quantum systems to perturbations. Two typical models are addressed: one is the transverse Ising model exhibiting a quantum phase transition, and the other is the one dimensional Heisenberg spin chain with next-nearest-neighbor interactions, which has the degeneracy. It is revealed that the operator fidelity susceptibility is a good indicator of quantum criticality regardless of the system degeneracy.
Cite
@article{arxiv.0803.2940,
title = {Operator fidelity susceptibility: an indicator of quantum criticality},
author = {Xiaoguang Wang and Zhe Sun and Z. D. Wang},
journal= {arXiv preprint arXiv:0803.2940},
year = {2009}
}
Comments
Four pages, two figures