Statistical fluctuation analysis for decoy-state quantum secure direct communication

Jooyoun Park, Bumil Kim, Jun Heo

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


In quantum secure direct communication (QSDC), messages are transmitted directly through quantum channels. The decoy state scheme has been widely studied to detect eavesdroppers and improve the secrecy capacity. However, the secret key rate becomes relatively low in this scheme because of the finite-size effect. In this study, the statistical fluctuation analyses of a four-intensity decoy-state QSDC system were performed, and a numerical simulation was conducted in an actual experimental environment. The simulation results were compared, and the parameters optimized using the Gaussian analysis and the Chernoff bound were presented.

Original languageEnglish
Article number112
JournalQuantum Information Processing
Issue number2
Publication statusPublished - 2023 Feb

Bibliographical note

Funding Information:
This work was supported by Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea government(MSIT) (No.2022-0-00463, Development of a quantum repeater in optical fiber networks for quantum internet). This research was supported by the MSIT(Ministry of Science and ICT), Korea, under the ITRC(Information Technology Research Center) support program(IITP-2023-2021-0-01810) supervised by the IITP(Institute for Information & Communications Technology Planning & Evaluation).

Publisher Copyright:
© 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.


  • Decoy state
  • Finite-size effect
  • Quantum secure direct communication

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Statistical and Nonlinear Physics
  • Theoretical Computer Science
  • Signal Processing
  • Modelling and Simulation
  • Electrical and Electronic Engineering


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