Fig. 1. Variance of entanglement among three atoms of A, B and C under different Γ2[Δ=0, Dij=0, Γ1/2=10Ω, W1=1.1, W2=0.1, α=1/2, β=γ=(1-α2)2]

Fig. 2. Variance of entanglement among three atoms of A, B and C under different Γ2[Δ=10Ω, Dij=0, Γ1/2=10Ω, W1=1.1, W2=0.1, α=1/2, β=γ=(1-α2)2]

Fig. 3. Variance of entanglement among three atoms of A, B and C under different Γ2[Δ=0, Dij=0, D(ωc)=0,Γ1/2=10Ω, W1=1.1, α=1/2, β=γ=(1-α2)2]

Fig. 4. Variance of entanglement among three atoms of A, B and C under different Δ[Dij=0, Γ1/2=10Ω, Γ2/2=Ω, W1=1.1, W2=0.1, α=1/2, β=γ=(1-α2)2]

Fig. 5. Variance of entanglement among three atoms of A, B and C under different Dij[Δ=0, Γ1/2=10Ω, Γ2/2=Ω, W1=1.0, W2=0.1, α=1/2, β=γ=(1-α2)2]. (a) Weak coupling mechanism; (b) strong coupling mechanism

Fig. 6. Variance of entanglement among three atoms of A, B and C under different Dij[Δ=0, Γ1/2=10Ω, Γ2/2=9Ω, W1=1.0, W2=0.9, α=1/2, β=γ=(1-α2)2]. (a) Weak coupling mechanism; (b) strong coupling mechanism

Fig. 7. Variance of entanglement among three atoms of A, B and C under different Dij[Δ=0, Γ1/2=10Ω, Γ2/2=0, W1=1.0, W2=0, α=1/2, β=γ=(1-α2)2]. (a) Weak coupling mechanism; (b) strong coupling mechanism