Quantum and Classical Cryptography for Security and Privacy of Photonic Networks

摘要

We have developed rigorous definitions and mathematical formalism for information leakage through possible eavesdropping on the quantum channel. We have investigated classical cryptograph using nonlinear optical processor based on three-wave and four-wave mixing in nonlinear crystals. The processors operate with femtosecond response time and unlike commonly used autocorrelators, allows time-to-space conversion of both amplitude and phase information carried by ultrashort pulses. Pulse position modulation is combined with CDMA techniques to allow enhanced privacy optical networking with ultrahigh bandwidth utilization.