Security improvement of using modified coherent state for quantum cryptography
Quantum Physics
2009-11-11 v1
Abstract
Weak coherent states as a photon source for quantum cryptography have limit in secure data rate and transmission distance because of the presence of multi-photon events and loss in transmission line. Two-photon events in a coherent state can be taken out by a two-photon interference scheme. We investigate the security issue of utilizing this modified coherent state in quantum cryptography. A 4 dB improvement in secure data rate or a nearly two-fold increase in transmission distance over the coherent state are found. With a recently proposed and improved encoding strategy, further improvement is possible.
Cite
@article{arxiv.quant-ph/0501175,
title = {Security improvement of using modified coherent state for quantum cryptography},
author = {Y. J. Lu and Luobei Zhu and Z. Y. Ou},
journal= {arXiv preprint arXiv:quant-ph/0501175},
year = {2009}
}
Comments
5 pages, 2 figures, to appear in Physical Review A