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A novel error correction protocol for continuous variable quantum key distribution

Gümüş, Kadir 1; Eriksson, Tobias A.; Takeoka, Masahiro; Fujiwara, Mikio; Sasaki, Masahide; Schmalen, Laurent 1; Alvarado, Alex
1 Communications Engineering Lab (CEL), Karlsruher Institut für Technologie (KIT)

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.


Verlagsausgabe §
DOI: 10.5445/IR/1000133639
Veröffentlicht am 08.06.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Communications Engineering Lab (CEL)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000133639
Erschienen in Scientific Reports
Verlag Nature Research
Band 11
Heft 1
Seiten 10465
Nachgewiesen in Dimensions
Web of Science
Scopus
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