A novel error correction protocol for continuous variable quantum key distribution

Kadir Gümüş, Tobias A. Eriksson, Masahiro Takeoka, Mikio Fujiwara, Masahide Sasaki, Laurent Schmalen, Alex Alvarado

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Article number10465
JournalScientific reports
Issue number1
Publication statusPublished - 2021 Dec
Externally publishedYes

ASJC Scopus subject areas

  • General


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