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Article

An Improved Slice Reconciliation Protocol for Continuous-Variable Quantum Key Distribution

by 1, 1,*, 1, 2,* and 3
1
Department of Computer Science and Technology, Harbin Institute of Technology, Harbin 150000, China
2
School of Electronics and Information Engineering, Shenzhen Polytechnic, Shenzhen 518000, China
3
School of Foreign Languages, Harbin Institute of Technology, Harbin 150000, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Rosario Lo Franco
Entropy 2021, 23(10), 1317; https://doi.org/10.3390/e23101317
Received: 25 August 2021 / Revised: 3 October 2021 / Accepted: 7 October 2021 / Published: 9 October 2021
(This article belongs to the Special Issue Practical Quantum Communication)
Reconciliation is an essential procedure for continuous-variable quantum key distribution (CV-QKD). As the most commonly used reconciliation protocol in short-distance CV-QKD, the slice error correction (SEC) allows a system to distill more than 1 bit from each pulse. However, the quantization efficiency is greatly affected by the noisy channel with a low signal-to-noise ratio (SNR), which usually limits the secure distance to about 30 km. In this paper, an improved SEC protocol, named Rotated-SEC (RSEC), is proposed through performing a random orthogonal rotation on the raw data before quantization, and deducing a new estimator for the quantized sequences. Moreover, the RSEC protocol is implemented with polar codes. The experimental results show that the proposed protocol can reach up to a quantization efficiency of about 99%, and maintain at around 96% even at the relatively low SNRs (0.5,1), which theoretically extends the secure distance to about 45 km. When implemented with the polar codes with a block length of 16 Mb, the RSEC achieved a reconciliation efficiency of above 95%, which outperforms all previous SEC schemes. In terms of finite-size effects, we achieved a secret key rate of 7.83×103 bits/pulse at a distance of 33.93 km (the corresponding SNR value is 1). These results indicate that the proposed protocol significantly improves the performance of SEC and is a competitive reconciliation scheme for the CV-QKD system. View Full-Text
Keywords: continuous-variable quantum key distribution; reconciliation; slice error correction; polar codes; finite-size effect continuous-variable quantum key distribution; reconciliation; slice error correction; polar codes; finite-size effect
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MDPI and ACS Style

Wen, X.; Li, Q.; Mao, H.; Wen, X.; Chen, N. An Improved Slice Reconciliation Protocol for Continuous-Variable Quantum Key Distribution. Entropy 2021, 23, 1317. https://doi.org/10.3390/e23101317

AMA Style

Wen X, Li Q, Mao H, Wen X, Chen N. An Improved Slice Reconciliation Protocol for Continuous-Variable Quantum Key Distribution. Entropy. 2021; 23(10):1317. https://doi.org/10.3390/e23101317

Chicago/Turabian Style

Wen, Xuan, Qiong Li, Haokun Mao, Xiaojun Wen, and Nan Chen. 2021. "An Improved Slice Reconciliation Protocol for Continuous-Variable Quantum Key Distribution" Entropy 23, no. 10: 1317. https://doi.org/10.3390/e23101317

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