Multidimensional quantum key distribution with single side pulse and single side band modulation multiplexing

Quantum Cryptography enables secret distribution between remotes parties where classical communications fail. The proposed technique uses optical signal modulation to encode information with relative phase difference between frequency separated signals. The single side band detection scheme (SSB) enables efficient secret key distribution. The system security is guaranteed with a strong reference protocol. One can use a fainted laser source without security breach for any distance. The maximizing initial average energy is then one photon per pulse. The implemented protocol includes an auto compensation system for the optical path fluctuations that make the system robust over long time periods.