Towards practical and fast Quantum Cryptography
Abstract
We present a new protocol for practical quantum cryptography, tailored for an implementation with weak coherent pulses. The key is obtained by a very simple time-of-arrival measurement on the data line; an interferometer is built on an additional monitoring line, allowing to monitor the presence of a spy (who would break coherence by her intervention). Against zero-error attacks (the analog of photon-number-splitting attacks), this protocol performs as well as standard protocols with strong reference pulses: the key rate decreases only as the transmission of the quantum channel. We present also two attacks that introduce errors on the monitoring line: the intercept-resend, and a coherent attack on two subsequent pulses. Finally, we sketch several possible variations of this protocol.
Cite
@article{arxiv.quant-ph/0411022,
title = {Towards practical and fast Quantum Cryptography},
author = {Nicolas Gisin and Gregoire Ribordy and Hugo Zbinden and Damien Stucki and Nicolas Brunner and Valerio Scarani},
journal= {arXiv preprint arXiv:quant-ph/0411022},
year = {2007}
}