The slope of a renormalized interaction curve gives the system-bath separability and a lower bound on entanglement entropy; in the weak-coupling limit this becomes a Lorentzian identical to the Anderson impurity spectral function.
Anderson.Basic Notions Of Condensed Matter Physics
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Correspondence between quasiparticle dissipation and quantum information decay in open quantum systems
The slope of a renormalized interaction curve gives the system-bath separability and a lower bound on entanglement entropy; in the weak-coupling limit this becomes a Lorentzian identical to the Anderson impurity spectral function.