Fig. 3
From: Probing the strongly driven spin-boson model in a superconducting quantum circuit
Spectral response and dynamics of the driven spin-boson system. a, b Observed and calculated transmission at the probe frequency for the moderately coupled Device II (α = 0.21) as function of static bias and pump strength. A clear structure of multi-photon resonances appears. The dashed lines indicate cuts at fixed bias where the dynamics in panels c, d are calculated. c,d Predicted dynamics of P(t) with P(0) = 1. e, f Observed and calculated spectrum of the ultrastrongly coupled Device III (with α = 0.8). The spectrum is smoothed, as compared to panels a, b, indicating fully incoherent dynamics. The black dashed line in f corresponds to the condition εeff = 2kBT/ħ for the effective nonequilibrium bias (see Eq. (7)) and the symbols “×” mark the first two zeroes of J0(εdτenv). g Time evolution of P(t) calculated at the symmetry point, ε0 = 0, in the same range of pump strengths as in panel f
