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Operator fidelity susceptibility, decoherence and quantum criticality

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 نشر من قبل Xiao-Ming Lu
 تاريخ النشر 2008
  مجال البحث فيزياء
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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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