Long-distance continuous-variable measurement-device-independent quantum key distribution with discrete modulation

Hong-Xin Ma, Peng Huang, Dong-Yun Bai, Tao Wang, Shi-Yu Wang, Wan-Su Bao, and Gui-Hua Zeng
Phys. Rev. A 99, 022322 – Published 20 February 2019

Abstract

We propose a long-distance continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol with discrete modulation. This kind of discrete-modulated scheme has good compatibility with efficient error correction code, which leads to higher reconciliation efficiency even at low signal-to-noise ratio. Security analysis shows that the proposed protocol is secure against arbitrary collective attacks in the asymptotic limit with the proper use of decoy states. With the use of discrete modulation, the proposed CV-MDI-QKD protocol has simpler implementation and outperforms previous protocols in terms of achievable maximal transmission distance, which precisely solved the bottleneck of the original Gaussian-modulated CV-MDI-QKD protocol.

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  • Received 14 December 2018

DOI:https://doi.org/10.1103/PhysRevA.99.022322

©2019 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Hong-Xin Ma1,2,3, Peng Huang3,*, Dong-Yun Bai3, Tao Wang3, Shi-Yu Wang3, Wan-Su Bao1,2, and Gui-Hua Zeng3

  • 1Zhengzhou Information Science and Technology Institute, Zhengzhou 450004, China
  • 2Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 3State Key Laboratory of Advanced Optical Communication Systems and Networks and Center of Quantum Information Sensing and Processing, Shanghai Jiao Tong University, Shanghai 200240, China

  • *Corresponding author: huang.peng@sjtu.edu.cn

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Issue

Vol. 99, Iss. 2 — February 2019

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