A novel error correction protocol for continuous variable quantum key distribution

Abstract Reconciliation 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 wit...

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Autores principales:	Kadir Gümüş, Tobias A. Eriksson, Masahiro Takeoka, Mikio Fujiwara, Masahide Sasaki, Laurent Schmalen, Alex Alvarado
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ee899bc3e157465b95bd5b27f4a8339b
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spelling	oai:doaj.org-article:ee899bc3e157465b95bd5b27f4a8339b2021-12-02T14:59:15ZA novel error correction protocol for continuous variable quantum key distribution10.1038/s41598-021-90055-32045-2322https://doaj.org/article/ee899bc3e157465b95bd5b27f4a8339b2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90055-3https://doaj.org/toc/2045-2322Abstract Reconciliation 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.Kadir GümüşTobias A. ErikssonMasahiro TakeokaMikio FujiwaraMasahide SasakiLaurent SchmalenAlex AlvaradoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kadir Gümüş Tobias A. Eriksson Masahiro Takeoka Mikio Fujiwara Masahide Sasaki Laurent Schmalen Alex Alvarado A novel error correction protocol for continuous variable quantum key distribution
description	Abstract Reconciliation 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.
format	article
author	Kadir Gümüş Tobias A. Eriksson Masahiro Takeoka Mikio Fujiwara Masahide Sasaki Laurent Schmalen Alex Alvarado
author_facet	Kadir Gümüş Tobias A. Eriksson Masahiro Takeoka Mikio Fujiwara Masahide Sasaki Laurent Schmalen Alex Alvarado
author_sort	Kadir Gümüş
title	A novel error correction protocol for continuous variable quantum key distribution
title_short	A novel error correction protocol for continuous variable quantum key distribution
title_full	A novel error correction protocol for continuous variable quantum key distribution
title_fullStr	A novel error correction protocol for continuous variable quantum key distribution
title_full_unstemmed	A novel error correction protocol for continuous variable quantum key distribution
title_sort	novel error correction protocol for continuous variable quantum key distribution
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ee899bc3e157465b95bd5b27f4a8339b
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A novel error correction protocol for continuous variable quantum key distribution

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