Simultaneous quantum cryptographic key distribution and conventional data transmission over installed fibre using wavelength-division multiplexing

摘要

Wavelength division multiplexing (WDM) is used to add a secure quantum key distribution channel (/spl lambda/=1300 nm) to a conventional 1.2 Gbit/s data channel (/spl lambda//spl sim/1550 nm) operating over 28 km of installed fibre in BT's London and East Anglia multiservice network testbed (LEANET). Error-free operation of the data channel is demonstrated with no degradation of the quantum channel performance.