The variances of the amplitude and phase quadrature as a function of the detuning for different phase difference: (a) ϕ₂ − ϕ₁ = 0; (b) ϕ₂ − ϕ₁ = π; (c) ϕ₂ − ϕ₁ = 0.5π. All the red solid and blue dashed curves represent the amplitude and phase quadrature, respectively. The common parameters for this situation are |g₁| = |g₂| = 5κ, J = 2κ, ε = 0.5κ, γ_a = 0.1κ, and κ₁ = κ₂ = κ.