scholarly journals High speed error correction for continuous-variable quantum key distribution with multi-edge type LDPC code

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Xiangyu Wang ◽  
Yichen Zhang ◽  
Song Yu ◽  
Hong Guo
Keyword(s):  
Error Correction ◽  
Quantum Key Distribution ◽  
High Speed ◽  
Ldpc Code ◽  
Key Distribution ◽  
Continuous Variable ◽  
Edge Type ◽  
Speed Error

High performance reconciliation for continuous-variable quantum key distribution with LDPC code

2015 ◽  
Vol 13 (02) ◽  
pp. 1550010 ◽  
Author(s):  
Dakai Lin ◽  
Duan Huang ◽  
Peng Huang ◽  
Jinye Peng ◽  
Guihua Zeng
Keyword(s):  
Quantum Key Distribution ◽  
Secure Communication ◽  
High Speed ◽  
High Performance ◽  
Graphics Processing Unit ◽  
Ldpc Code ◽  
Key Distribution ◽  
Continuous Variable ◽  
Processing Unit ◽  
Secret Key

Reconciliation is a significant procedure in a continuous-variable quantum key distribution (CV-QKD) system. It is employed to extract secure secret key from the resulted string through quantum channel between two users. However, the efficiency and the speed of previous reconciliation algorithms are low. These problems limit the secure communication distance and the secure key rate of CV-QKD systems. In this paper, we proposed a high-speed reconciliation algorithm through employing a well-structured decoding scheme based on low density parity-check (LDPC) code. The complexity of the proposed algorithm is reduced obviously. By using a graphics processing unit (GPU) device, our method may reach a reconciliation speed of 25 Mb/s for a CV-QKD system, which is currently the highest level and paves the way to high-speed CV-QKD.

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.

Comprehensive high-speed reconciliation for continuous-variable quantum key distribution

2020 ◽  
Vol 19 (9) ◽  
Author(s):  
Dabo Guo ◽  
Chao He ◽  
Tianhao Guo ◽  
Zhe Xue ◽  
Qiang Feng ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
High Speed ◽  
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 Discrete-variable quantum key distribution with homodyne detection

Quantum ◽  
2022 ◽  
Vol 6 ◽  
pp. 613
Author(s):  
Ignatius William Primaatmaja ◽  
Cassey Crystania Liang ◽  
Gong Zhang ◽  
Jing Yan Haw ◽  
Chao Wang ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
High Speed ◽  
Cost Effective ◽  
Key Distribution ◽  
Continuous Variable ◽  
Discrete Variable ◽  
Quantum State Preparation ◽  
High Bandwidth ◽  
The Cost ◽  
Selection Of

Most quantum key distribution (QKD) protocols can be classified as either a discrete-variable (DV) protocol or continuous-variable (CV) protocol, based on how classical information is being encoded. We propose a protocol that combines the best of both worlds – the simplicity of quantum state preparation in DV-QKD together with the cost-effective and high-bandwidth of homodyne detectors used in CV-QKD. Our proposed protocol has two highly practical features: (1) it does not require the honest parties to share the same reference phase (as required in CV-QKD) and (2) the selection of decoding basis can be performed after measurement. We also prove the security of the proposed protocol in the asymptotic limit under the assumption of collective attacks. Our simulation suggests that the protocol is suitable for secure and high-speed practical key distribution over metropolitan distances.

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