Open AccessAnalysis of decoy state quantum-key-distribution system
Author(s) -
Rongzhen Jiao,
Wenhan Zhang
Publication year - 2009
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.58.2189
Subject(s) - decoy , quantum key distribution , key generation , computer science , signal (programming language) , state (computer science) , physics , topology (electrical circuits) , photon , statistical physics , quantum mechanics , algorithm , mathematics , cryptography , biochemistry , chemistry , receptor , combinatorics , programming language
The security of quantum-key-distribution system is analyzed using the decoy state protocol with two weak decoy states and one signal state. The comparison is based on the key generation rate as a function of distance for two types of decoy states: the vacuum and a weak decoy state, asymptotically approaching the theoretical limit of the most general type of decoy protocol, one-decoy-state protocol. We studied the two-decoy-state protocol in connection with the intensity of signal state, and the gain of signal states, the overall quantum bit error rate, the gain of single-photon states and the error rate of single-photon states and arrived at the optimal condition which maximizes the key generation rate.