For synchronization cotrol of chaotic systems with different structures and unkown parameters, synchronization controller is designed and stability of error system is analyzed theoretically. With reasonably selected optimization objective function and quantum-behaved particle swarm optimization, unknown parameters identification of chaotic system are realized, which reduces effectively development difficulty of the synchronization controller. Synchronization between Rössler chaotic system and Lorenz chaotic system is studied, and numerical experiments are carried out. It shows that the proposed method achieves fast synchronization of drive-response system and accurate identification of unknown system parameters, which verifies feasibility and effectiveness of the method.

Quantum key generation rate of decoy state quantum key distribution(QKD) with a heralded single-photon source(HSPS) is deduced.Relationship between quantum key generation rate and detection efficiency of sender is discussed.Optimal intensities and key generation rate of decoy state QKD with a weak coherent pulse(WCP) and an HSPS are analyzed.It shows that key generation rate increases with increase of detection efficiency of sender and its security distance is the same as with a perfect single photon source.Decoy state QKD increases security distance and key rate of QKD.Due to less dark counts QKD with HSPS works longer distance than WCP.