Fig. 1: Universal small-signal model of a quantum device embedded in a classical circuit.
From: Unified linear response theory of quantum electronic circuits
Circuit elements are color-coded according to the description they originate from: input-output (blue) or semiclassical (red). Moreover, in this work we introduce a third branch (black), arising from a consistent quantum description of (detuning-dependent) dynamical decoherence. Notably, the input-output and semiclassical models overlap only in the description of the quantum capacitance (upper left).
