Abstract
This paper presents chaos synchronization between two identical chaotic systems via nonlinear control technique. The used system is complex Rossler system. The maximal Lyapunov exponent and the sensitivity on initial conditions are calculated of such system and they emphasis its chaotic behavior. The nonlinear control method has been applied successfully to synchronize the proposed system. Based on Lyaponov function the control input vectors are selected and activated to achieve synchronization. Finally, the numerical simulation are used to show the robustness and effectiveness of proposed method.