Coherent pulse position modulation quantum cipher supported by secret key
Abstract
A quantum cipher supported by a secret key so called keyed communication in quantum noise (KCQ) is very attractive in implementing high speed key generation and secure data transmission. However, Yuen-2000 as a basic model of KCQ has a difficulty to ensure the quantitative security evaluation because all physical parameter for the cipher system is finite. Recently, an outline of a generalized scheme so called coherent pulse position modulation(CPPM) to show the rigorous security analysis is given, where the parameters are allowed to be asymptotical. This may open a new way for the quantum key distribution with coherent states of considerable energy and high speed. In this paper, we clarify a generation method of CPPM quantum signal by using a theory of unitary operator and symplectic transformation, and show an asymptotic property of security and its numerical examples.
Cite
@article{arxiv.1007.1696,
title = {Coherent pulse position modulation quantum cipher supported by secret key},
author = {Masaki Sohma and Osamu Hirota},
journal= {arXiv preprint arXiv:1007.1696},
year = {2010}
}
Comments
5pages, 1figure, submitted to Physical Review A