We describe a new method for quantum key distribution that utilizes phase modulation of sidebands of modulation by use of integrated electro-optic modulators at the transmitting and receiving modules. The system is shown to produce constructive or destructive interference with unity visibility, which should allow quantum cryptography to be carried out with high flexibility by use of conventional devices.
© 1999 Optical Society of America
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.5060) Fiber optics and optical communications : Phase modulation
(270.0270) Quantum optics : Quantum optics
(350.2460) Other areas of optics : Filters, interference
Jean-Marc Mérolla, Yuri Mazurenko, Jean-Pierre Goedgebuer, Henri Porte, and William T. Rhodes, "Phase-modulation transmission system for quantum cryptography," Opt. Lett. 24, 104-106 (1999)