Operator fidelity susceptibility, decoherence and quantum criticality

Details Operator fidelity susceptibility, decoherence and quantum criticality Operator fidelity susceptibility, decoherence and quantum criticality

2008-07-09

arxiv.org/abs/0807.1370v2

Phys. Rev. A 78, 032309 (2008)

Physics

Quantum Physics

7 pages, 3 figures, references added

Scientific paper

10.1103/PhysRevA.78.032309

The extension of the notion of quantum fidelity from the state-space level to the operator one can be used to study environment-induced decoherence. state-dependent operator fidelity sucepti- bility (OFS), the leading order term for slightly different operator parameters, is shown to have a nontrivial behavior when the environment is at critical points. Two different contributions to OFS are identified which have distinct physical origins and temporal dependence. Exact results for the finite-temperature decoherence caused by a bath described by the Ising model in transverse field are obtained.

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