Open AccessQuantum key distribution using binary-modulated coherent states
Author(s) -
Guangqiang He,
Guo Hong-Bin,
Li Yu-Dan,
Zhu Si-Wei,
Guihua Zeng
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.2212
Subject(s) - quantum key distribution , coherent states , modulation (music) , binary number , computer science , demodulation , gaussian , quantum channel , beam splitter , quantum cryptography , physics , electronic engineering , channel (broadcasting) , topology (electrical circuits) , quantum information , optics , telecommunications , quantum , quantum mechanics , mathematics , laser , arithmetic , acoustics , combinatorics , engineering
A quantum key distribution (QKD) scheme using binary-modulated coherent states is proposed in this paper. Compared with Gaussian sources of QKD using Gaussian-modulated coherent states, the binary sources of the proposed scheme are the simplest sources, and the binary modulation is the most usual modulation format in the digital optical-fiber communication. The security of the proposed schemeagainst beam splitter attack is analyzed using Shannon information theory. The analytical expression of the secret information rate is given in terms of modulation-demodulation parameters and channel parameters. The quantum noise of coherent states guarantees the security of the proposed scheme.