High Efficiency Error Correction for Continuous-Variable Quantum Key Distribution using Raptor-Like LDPC Codes

2020 ◽  
Author(s):  
Chao Zhou ◽  
Xiangyu Wang ◽  
Yichen Zhang ◽  
Zhiguo Zhang ◽  
Song Yu
Keyword(s):  
Error Correction ◽  
Quantum Key Distribution ◽  
High Efficiency ◽  
Ldpc Codes ◽  
Key Distribution ◽  
Continuous Variable

scholarly journals A novel error correction protocol for continuous variable quantum key distribution

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kadir Gümüş ◽  
Tobias A. Eriksson ◽  
Masahiro Takeoka ◽  
Mikio Fujiwara ◽  
Masahide Sasaki ◽  
...  
Keyword(s):  
Error Correction ◽  
Quantum Key Distribution ◽  
Ldpc Codes ◽  
Key Distribution ◽  
Continuous Variable ◽  
Early Termination ◽  
Parity Check ◽  
Secret Key ◽  
Ldpc Decoder ◽  
And Performance

AbstractReconciliation is a key element of continuous-variable quantum key distribution (CV-QKD) protocols, affecting both the complexity and performance of the entire system. During the reconciliation protocol, error correction is typically performed using low-density parity-check (LDPC) codes with a single decoding attempt. In this paper, we propose a modification to a conventional reconciliation protocol used in four-state protocol CV-QKD systems called the multiple decoding attempts (MDA) protocol. MDA uses multiple decoding attempts with LDPC codes, each attempt having fewer decoding iteration than the conventional protocol. Between each decoding attempt we propose to reveal information bits, which effectively lowers the code rate. MDA is shown to outperform the conventional protocol in regards to the secret key rate (SKR). A 10% decrease in frame error rate and an 8.5% increase in SKR are reported in this paper. A simple early termination for the LDPC decoder is also proposed and implemented. With early termination, MDA has decoding complexity similar to the conventional protocol while having an improved SKR.

High efficiency continuous-variable quantum key distribution based on QC-LDPC codes

2019 ◽  
Vol 17 (11) ◽  
pp. 112701
Author(s):  
Ying Guo ◽  
Kangshuai Wang ◽  
Duan Huang ◽  
Xueqin Jiang
Keyword(s):  
Quantum Key Distribution ◽  
High Efficiency ◽  
Ldpc Codes ◽  
Key Distribution ◽  
Continuous Variable

scholarly journals On the problem of non-zero word error rates for fixed-rate error correction codes in continuous variable quantum key distribution

2017 ◽  
Vol 19 (2) ◽  
pp. 023003 ◽  
Author(s):  
Sarah J Johnson ◽  
Andrew M Lance ◽  
Lawrence Ong ◽  
Mahyar Shirvanimoghaddam ◽  
T C Ralph ◽  
...  
Keyword(s):  
Error Correction ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
Error Rates ◽  
Error Correction Codes ◽  
Fixed Rate

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

Entropy ◽  
2020 ◽  
Vol 22 (10) ◽  
pp. 1087 ◽  
Author(s):  
Kun Zhang ◽  
Xue-Qin Jiang ◽  
Yan Feng ◽  
Runhe Qiu ◽  
Enjian Bai
Keyword(s):  
Computational Complexity ◽  
Quantum Key Distribution ◽  
Rapid Development ◽  
Ldpc Codes ◽  
Key Distribution ◽  
Continuous Variable ◽  
Parity Check ◽  
Secret Key ◽  
Information Reconciliation ◽  
Transmission Distance

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.

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