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RC-LDPC-Polar Codes for Information Reconciliation in Continuous-Variable Quantum Key Distribution.

Fei Hua1,2,3, Kun Chen1,2,3, Wei Deng1,2,3

  • 1Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China.

Entropy (Basel, Switzerland)
|October 28, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel RC-LDPC-Polar code to improve continuous-variable quantum key distribution (CV-QKD) under noisy conditions. The new code enhances error correction, boosting key rates and transmission distances for secure quantum communication.

Keywords:
cascade polar codescontinuous-variable quantum key distributioninformation reconciliationrate compatibility

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Area of Science:

  • Quantum Information Science
  • Coding Theory
  • Telecommunications

Background:

  • Continuous-variable quantum key distribution (CV-QKD) is challenged by quantum channel instability, including signal-to-noise ratio (SNR) fluctuations and low SNR environments.
  • Non-ideal polar codes exhibit insufficient polarization, limiting error correction in information reconciliation for CV-QKD.

Purpose of the Study:

  • To propose a novel concatenated coding scheme, RC-LDPC-Polar, for CV-QKD information reconciliation.
  • To enhance the error resilience and efficiency of CV-QKD under varying SNR conditions.

Main Methods:

  • Developed a novel RC-LDPC-Polar concatenated code combining LDPC and polar coding.
  • Implemented adaptive rate adjustment for varying SNR conditions.
  • Conducted simulation experiments to evaluate the coding scheme's performance.

Main Results:

  • The RC-LDPC-Polar scheme demonstrated a lower error rate across different SNR conditions.
  • Achieved a higher final key rate compared to existing methods.
  • Enabled longer transmission distances for CV-QKD.

Conclusions:

  • The proposed RC-LDPC-Polar code effectively addresses challenges in CV-QKD reconciliation.
  • This coding scheme offers improved performance, paving the way for more robust and longer-distance quantum key distribution.