We report an intrinsically stable quantum key distribution scheme based on genuine frequency-coded quantum states. The qubits are efficiently processed without fiber interferometers by fully exploiting the nonlinear interaction occurring in electro-optic phase modulators. The system requires only integrated off-the-shelf devices and could be used with a true single-photon source. Preliminary experiments have been performed with weak laser pulses and have demonstrated the feasibility of this new setup.
© 2007 Optical Society of America
Original Manuscript: September 11, 2006
Manuscript Accepted: October 26, 2006
Published: January 12, 2007
Matthieu Bloch, Steven W. McLaughlin, Jean-Marc Merolla, and Frédéric Patois, "Frequency-coded quantum key distribution," Opt. Lett. 32, 301-303 (2007)