High Efficiency Continuous-Variable Quantum Key Distribution Based on ATSC 3.0 LDPC Codes.

Kun Zhang,Xue-Qin Jiang,Yan Feng,Runhe Qiu,Enjian Bai

doi:10.3390/e22101087

Abstract

Due to the rapid development of quantum computing technology, encryption systems based on computational complexity are facing serious threats. Based on the fundamental theorem of quantum mechanics, continuous-variable quantum key distribution (CVQKD) has the property of physical absolute security and can effectively overcome the dependence of the current encryption system on the computational complexity. In this paper, we construct the spatially coupled (SC)-low-density parity-check (LDPC) codes and quasi-cyclic (QC)-LDPC codes by adopting the parity-check matrices of LDPC codes in the Advanced Television Systems Committee (ATSC) 3.0 standard as base matrices and introduce these codes for information reconciliation in the CVQKD system in order to improve the performance of reconciliation efficiency, and then make further improvements to final secret key rate and transmission distance. Simulation results show that the proposed LDPC codes can achieve reconciliation efficiency of higher than 0.96. Moreover, we can obtain a high final secret key rate and a long transmission distance through using our proposed LDPC codes for information reconciliation.

Highlights

Quantum key distribution (QKD) [1,2,3] is one of the most pragmatic applications of quantum communication technologies
In DVQKD, the polarization or phase of weak coherent states is used as the carrier of information and the quantum states received are measured by using a single-photon detector
Such detectors used in continuous-variable quantum key distribution (CVQKD) systems are routinely deployed in classical optical communications; the CVQKD system offers very good prospects for implementations based on mature telecom components [4]

Summary

Introduction

Quantum key distribution (QKD) [1,2,3] is one of the most pragmatic applications of quantum communication technologies. In DVQKD, the polarization or phase of weak coherent states is used as the carrier of information and the quantum states received are measured by using a single-photon detector. In continuous-variable quantum key distribution (CVQKD), the amplitudes and phase quadratures of Gaussian-modulated coherent states are considered to be the carriers of information and the receiver utilizes homodyne or heterodyne detection techniques to measure the transmitted quantum states [9]. For a CVQKD system based on Gaussian-modulated coherent states, future-proof security against collective attacks has been provided. Such detectors used in CVQKD systems are routinely deployed in classical optical communications; the CVQKD system offers very good prospects for implementations based on mature telecom components [4]

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Methods

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Conclusion