3.3 Gigahertz Clocked Quantum Key Distribution System
  A fibre-based quantum key distribution system operating up to a clock frequency of 3.3GHz is presented. The system demonstrates significantly increased key exchange rate potential and operates at a wavelength of 850nm. 
Karen J. Gordon, Veronica Fernandez, Robert J. Collins, Ivan Rech,   Sergio D. Cova, Paul D. Townsend, and Gerald S. Buller