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Using Chaotic Dynamics in Quantum Cryptographic Systems: Chaotic Cryptography and Repeaters

Quantum cryptography is a potential technique for data security in communications networks. However, it still must overcome some implementation problems to become commercial, such as the limited distance between network's users, low transmission rate of quantum data and the decoherence suffered by the quantum state during propagation in the channel. On the other hand, chaotic systems show rich dynamics with very interesting properties that can be used in communications. In this direction, we propose the use of suitable properties of chaotic systems, such as great sensitivity to initial conditions, unpredictability, controllability and synchronisation of chaotic systems to overcome some problems of quantum cryptography.