Open AccessStable differential-phase-shift quantum key distribution based on weak coherent pulses
Author(s) -
Feng Qing Zhao,
Lu Yi-Qun,
Wang Fa-Qiang,
Xia Chen,
Mingming Li,
Banghong Guo,
Liao Chang-Jun,
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.56.2175
Subject(s) - quantum key distribution , computer science , differential phase , key (lock) , key distribution , interferometry , key generation , michelson interferometer , quantum cryptography , photon , optics , electronic engineering , physics , quantum , quantum information , telecommunications , algorithm , cryptography , public key cryptography , quantum mechanics , computer network , encryption , keying , computer security , engineering
Differential phase shift quantum key distribution(DPSQKD) experiment based on weak coherent pulses have been performed in the laboratory. We encoded the bit information between the consecutive pulses. The bit information was decoded at Bob's side by Michelson-Faraday interferometer and single photon detector. This kind of quantum key distribution system can provide stable key distribution process, high efficiency of key creation, and high security key. So it is easily implemented in optical fibers using readily available optical telecommunication tools. We experimented DPSQKD over 76 km on fiber, the error rate of the sifted key is 5.3%. The quantum key distribution process is controlled by micro-computer based on ARM (advanced RISC(reduced instruction set computing) machines) processor.