Open AccessA phase modulated QKD system with two quantum cryptography protocols
Author(s) -
Xia Chen,
Wang Fa-Qiang,
Lu Yi-Qun,
Feng Qing Zhao,
Mingming Li,
Mi Jing-Long,
Renrong Liang,
Songhao Liu
Publication year - 2007
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.56.6434
Subject(s) - quantum key distribution , bb84 , quantum cryptography , interferometry , computer science , physics , michelson interferometer , optics , quantum , quantum information , quantum mechanics , photon
An improved DPS-QKD scheme is proposed and demonstrated in this paper. At Alice's sitewe use a M-Z interferometer to produce two coherent pulses. At Bob's sitea Faraday-mirrors-based Michelson interferometer is used instead of a M-Z interferometer to auto-compensate for the phase drifts and polarization mode dispersions in the fiber. It enhances the security of the whole system to use the two quantum cryptography protocols (namely the two pulse DPS-QKD scheme associated with the BB84 scheme). It is shown in our experiment that such a system features perfect stability with a quantum bit error rate less than 5% and high key generation rate. This scheme has been implemented successfully during the 80km fiber transmission.