Experimental Demonstration of High-Rate Discrete-Modulated Continuous-Variable Quantum Key Distribution System

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 algorithms and advanced analytical security proof method, the transmission results of 5 km, 10 km, 25 km, and 50 km are achieved for the 1 GBaud optimized quantum signals. Correspondingly, the asymptotic secret key rate (SKR) is 288.421 Mbps, 159.395 Mbps, 50.004 Mbps and 7.579 Mbps for discrete Gaussian (DG) 64QAM, and 326.708 Mbps, 179.348 Mbps, 50.623 Mbps and 9.212 Mbps for DG 256QAM. Under the same parameters, the achieved SKRs of DG 256QAM is almost same to 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.

5 pages, 5 figures

References in corpus (4)

• Improvement of continuous-variable quantum key distribution systems by using optical preamplifiers
• Asymptotic security of continuous-variable quantum key distribution with a discrete modulation
• Explicit asymptotic secret key rate of continuous-variable quantum key distribution with an arbitrary modulation
• Security of Binary Modulated Continuous Variable Quantum Key Distribution under Collective Attacks

Cited by in corpus (6)

• Sub-Mbps key-rate continuous-variable quantum key distribution with local-local-oscillator over 100 km fiber
• Experimental Demonstration of Sequential Multiparty Quantum Secret Sharing and Quantum Conference Key Agreement
• Experimental Demonstration of Discrete Modulation Formats for Continuous Variable Quantum Key Distribution
• Discrete-modulation continuous-variable quantum key distribution with high key rate
• Practical Continuous-variable Quantum Key Distribution with Feasible Optimization Parameters
• Performance analysis for OFDM-based multi-carrier continuous-variable quantum key distribution with arbitrary modulation protocol