We report a new transmission that can be used for quantum key distribution. The system uses single-sideband-modulated light in an implementation of the BB84 quantum cryptography protocol. The system is formed by two integrated unbalanced Mach–Zehnder interferometers and is based on interference between phase-modulated sidebands in the spectral domain. Experiments show that high interference visibility can be obtained.
© 2001 Optical Society of America
Laurent Duraffourg, Jean-Marc Merolla, Jean-Pierre Goedgebuer, *Yuri Mazurenko, and William T. Rhodes, "Compact transmission system using single-sideband modulation of light for quantum cryptography," Opt. Lett. 26, 1427-1429 (2001)