Figure 5.

Theoretical results for a resonantly driven two-level system coupled to a bath. T₁ was set to 60 ℏ/Δ. The case without dissipation corresponds to T₁ = T₂ = ∞. (a) Population dynamics of the upper electronic level for different decoherence times T₂ (upper panel) in the presence of an external driving field (lower panel). (b) Quasienergy spectrum of the driven electronic system once a steady state is reached for different decoherence times T₂. (c) Floquet fidelity of the nonequilibrium steady states as a function of field strength for different decoherence times T₂. Gray lines correspond to off-resonant driving with T₂ = 5 ℏ/Δ.