Fig. 2

Theoretically computed evolution of the coherence terms (off-diagonal terms ρ_m,n, m ≠ n) of the reduced density matrices arising in waveguide trimers exhibiting dephasing rates (top) γ = 0.3γ_exp, (center) γ = 0.6γ_exp, and (bottom) γ = γ_exp, where γ_exp = (γ₁, γ₂, γ₃) = γ_exp = (1.7275, 1.7435, 1.7645) cm⁻¹ are the dephasing rates obtained from the experimental parameters used to fabricate the structures utilized in the experiments shown Fig. 1f. In all cases the coherences ρ_m,n inherently vanish after certain propagation distance. The length of the simulated systems was 10 cm and the propagation constants were taken from a Gaussian distribution with identical variance σ = 3 cm⁻¹, and mean values β = 1 cm⁻¹ and β = −1 cm⁻¹ for the upper and lower waveguides, respectively