Figure 3

Temporal evolution of populations ρ₁₁ (red curve), ρ₂₂ (green curve), ρ₃₃ (blue curve), and ρ₄₄ (black curve) for the four different values of the chirp rate. (a) η = ⁻¹ rad; (b) η = −0.5 rad; (c) η = 0; (d) η = 0.6 rad. Other parameters are Ω₁ = 2 fs⁻¹, Ω₂ = 5 fs⁻¹, B = 3 T, ω _c  = 0.1 fs⁻¹, ω₁ = 0.24 fs⁻¹, ω₂ = 0.1 fs⁻¹, γ₂ = 0.003 fs⁻¹, γ₃ = γ₄ = 0.03 fs⁻¹, τ = 5 fs, and τ _c  = 4.84 fs.