Abstract:

At present the most important problem of quantum key distribution is how to realize the key transmission for long distance and high key generation rate.We apply the idea of using dual detectors in quantum key distribution and perform simulations for BBM92 quantum key distribution system with ideal and parametric down conversion sources. Simulation results demonstrate significant improvements of keys generation rate in BBM92 protocol using dual detectors, as well as lower error bit rate. Secure communication distance can reach 300km when ideal sources are introduced and 250km with parametric down conversion sources.

Key words: quantum optics, quantum key distribution, dual detectors, BBM92 protocol, key generation rate