Affiliation:
1. Institute of Southwestern Communication
2. Chongqing University
Abstract
A high-rate continuous-variable quantum key distribution (CV-QKD) system based on high-order discrete modulation is experimentally investigated. With the help of the novel system scheme, effective digital signal processing (DSP) algorithms and advanced analytical security proof methods, the transmission results of 5.059 km, 10.314 km, 24.490 km, and 50.592 km are achieved for 1 GBaud optimized quantum signals. Correspondingly, the asymptotic secret key rates (SKRs) are 292.185 Mbps, 156.246 Mbps, 50.491 Mbps, and 7.495 Mbps for discrete Gaussian (DG) 64QAM, and 328.297 Mbps, 176.089 Mbps, 51.304 Mbps, and 9.193 Mbps for DG 256QAM, respectively. Under the same parameters, the achieved SKRs of DG 256QAM is almost same as ideal Gaussian modulation. In this case, the demonstrated high-rate discrete-modulated CV-QKD system has the application potential for high-speed security communication under tens of kilometers.
Funder
National Key Research and Development Program of China
The National Science Foundation of China
the Chengdu Major Science and Technology Innovation Program
the Chengdu Key Research and Development Support Program
the Technology Innovation and Development Foundation of China Cyber Security
the Sichuan Application and Basic Research Funds
the Sichuan Science and Technology Program
National Science Key Lab Fund Project
Subject
Atomic and Molecular Physics, and Optics
Cited by
38 articles.
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