Reduced Order Projective and Hybrid Projective Combination-Combination Synchronization of Four Chaotic Josephson Junctions

Figure 7

Error dynamics of the drive and the response systems with controllers activated for 𝑡≥0, where 𝑒₁=𝑤₁+𝑧₁−(0.5𝑥₁+0.7𝑦₁+0.2𝑥₃+0.3𝑦₃), 𝑒₂=𝑤₂+𝑧₂+(0.4𝑥₂+1.2𝑦₂), and 𝑒=𝑒²₁+𝑒²₂.

(a)

(b)

(c)