Discretely modulated continuous-variable quantum key distribution with a nondeterministic noiseless amplifier
Date
2013
Authors
Fang, J.
Lu, Y.
Huang, P.
He, G.
Zeng, G.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
International Journal of Quantum Information, 2013; 11(4, article no. 1350037):1350037-1-1350037-18
Statement of Responsibility
Conference Name
Abstract
In this paper, we first study a generalized protocol of discrete modulation for continuous-variable quantum key distribution with N coherent states in a Gaussian lossy and noisy channel and investigate its performance against collective attacks. We find that discrete modulation protocols with more than eight states do not perform better than the eight-state protocol. Then, we study the improvement of this protocol by using a nondeterministic noiseless linear amplifier (NLA) on Bob's detection stage. Results indicate that a NLA with gain g can extend the maximum transmission distance by 50 log10g2km and can increase the maximal tolerable excess noise. With the reconciliation efficiency β, we find the gain of NLA has a maximal value defined as gmaxand by adjusting the gain to about βgmaxone can have the best improvement on secret key rate.
School/Discipline
Dissertation Note
Provenance
Description
Access Status
Rights
Copyright 2013 World Scientific Publishing Company