title: Spectral coherent-state quantum cryptography.
abstract: 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.
authors.affiliation: Department of Applied Electronics, University of Roma Tre, Roma, Italy. cincotti@uniroma3.it
authors.forename: Gabriella
authors.initials: G
authors.lastname: Cincotti
authors.forename: Leo
authors.initials: L
authors.lastname: Spiekman
authors.forename: Naoya
authors.initials: N
authors.lastname: Wada
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Kitayama