Fig. 4: Number of positive Lyapunov exponents M vs. number of qubits N in the ring chain.
From: Emergence and control of complex behaviors in driven systems of interacting qubits with dissipation

Δ = 5, Ω = 2.5, c = 5.
From: Emergence and control of complex behaviors in driven systems of interacting qubits with dissipation
Δ = 5, Ω = 2.5, c = 5.