Operator fidelity susceptibility: an indicator of quantum criticality

Details Operator fidelity susceptibility: an indicator of quantum criticality Operator fidelity susceptibility: an indicator of quantum criticality

2008-03-20

arxiv.org/abs/0803.2940v2

Physics

Quantum Physics

Four pages, two figures

Scientific paper

10.1103/PhysRevA.79.012105

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.

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