A novel implementation of quantum-noise optical cryptography is proposed, which is based on a simplified architecture that allows long-haul, high-speed transmission in a fiber optical network. By using a single multiport encoder/decoder and 16 phase shifters, this new approach can provide the same confidentiality as other implementations of Yuen’s encryption protocol, which use a larger number of phase or polarization coherent states. Data confidentiality and error probability for authorized and unauthorized receivers are carefully analyzed.
© 2008 Optical Society of America
Original Manuscript: July 1, 2008
Manuscript Accepted: September 3, 2008
Published: October 22, 2008
Gabriella Cincotti, Leo Spiekman, Naoya Wada, and Ken-ichi Kitayama, "Spectral coherent-state quantum cryptography," Opt. Lett. 33, 2461-2463 (2008)