Improving the maximum transmission distance of four-state continuous-variable quantum key distribution by using a noiseless linear amplifier

Bingjie Xu, Chunming Tang, Hui Chen, Wenzheng Zhang, and Fuchen Zhu

Phys. Rev. A 87, 062311 – Published 11 June 2013

Abstract

A modified four-state CVQKD protocol is proposed to increase the maximum transmission distance and tolerable excess noise in the presence of Gaussian lossy and noisy channel by using a noiseless linear amplifier (NLA). An ideal NLA with gain $g$ can increase the maximum admission losses by $20 \log_{10} g$ dB. Further, the imperfections in a practical NLA, such as the finite detection efficiency and imperfect single-photon source, are included in consideration.

2 More

Received 29 September 2012

DOI:https://doi.org/10.1103/PhysRevA.87.062311

Authors & Affiliations

Bingjie Xu^1,2,*, Chunming Tang^3,†, Hui Chen^1,2, Wenzheng Zhang^1,2, and Fuchen Zhu^1,2

¹Science and Technology on Security Communication Laboratory, 610041 Cheng Du, China
²Institute of Southwestern Communication, 610041 Cheng Du, China
³School of Mathematics and Information, China West Normal University, 637002 Nanchong, China

^*xbjpku@pku.edu.cn
^†Corresponding author: tangchunmingmath@163.com

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 87, Iss. 6 — June 2013

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review A

covering atomic, molecular, and optical physics and quantum information