https://doi.org/10.1140/epjd/e2012-20757-5
Regular Article
Effect of intensity modulator extinction on practical quantum key distribution system
Key Laboratory of Quantum Information, University of Science and
Technology of China, Hefei
230026, P.R.
China
a
e-mail: jzhuang@mail.ustc.edu.cn
Received: 26 December 2011
Received in final form: 30 March 2012
Published online: 29 June 2012
We study how the imperfection of intensity modulator effects on the security of a practical quantum key distribution system. The extinction ratio of the realistic intensity modulator is considered in our security analysis. We show that the secret key rate increases, under the practical assumption that the indeterminable noise introduced by the imperfect intensity modulator can not be controlled by the eavesdropper.
Key words: Quantum Information
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2012
