Open AccessA new differential phase shift quantum key distribution system with Faraday-Michelson interferometer
Author(s) -
Zhengjun Wei,
Wan Wei,
Jindong Wang,
Liao Chang-Jun,
Songhao Liu
Publication year - 2011
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.60.094216.2
Subject(s) - quantum key distribution , michelson interferometer , faraday cage , physics , interferometry , optics , differential phase , photon , phase (matter) , quantum mechanics , magnetic field
A new differential phase shift quantum key distribution system based on the intensity modulator with Faraday-Michelson interferometer is demonstrated experimentally. Some technologies are employed to improve the performance of the quantum key distribution system. These technologies include the clock generation technology of arbitrary frequency by a small scale frequency-split and phase locked loop scheme, the new method to acquire the half-wave voltage of the phase modulator with a high accuracy in the condition of the single photon count, and the auto-compensated polarization technology by the Faraday-Michelson interferometer. Finally, the quantum key distribution is achieved with a quantum bit error rate of 3.9% when the transmission distance reaches 50 km.