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An Improved Slice Reconciliation Protocol for Continuous-Variable Quantum Key Distribution.

Xuan Wen1, Qiong Li1, Haokun Mao1

  • 1Department of Computer Science and Technology, Harbin Institute of Technology, Harbin 150000, China.

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Summary
This summary is machine-generated.

A new Rotated-Slice Error Correction (RSEC) protocol enhances quantum key distribution by improving data processing before quantization. This method significantly boosts secure communication distances for continuous-variable quantum key distribution (CV-QKD) systems.

Keywords:
continuous-variable quantum key distributionfinite-size effectpolar codesreconciliationslice error correction

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Information Theory

Background:

  • Reconciliation is crucial for continuous-variable quantum key distribution (CV-QKD).
  • Slice Error Correction (SEC) is common for short-distance CV-QKD but limited by low signal-to-noise ratios (SNRs).
  • Current SEC protocols restrict secure distances to approximately 30 km due to quantization efficiency issues in noisy channels.

Purpose of the Study:

  • To introduce an improved reconciliation protocol, Rotated-SEC (RSEC), for CV-QKD.
  • To enhance quantization efficiency and extend the secure communication distance.
  • To evaluate the performance of RSEC when implemented with polar codes.

Main Methods:

  • Proposed the Rotated-SEC (RSEC) protocol, involving random orthogonal rotation of raw data before quantization.
  • Developed a new estimator for processing quantized sequences within the RSEC protocol.
  • Implemented the RSEC protocol using polar codes with a block length of 16 Mb.

Main Results:

  • RSEC achieved a quantization efficiency of approximately 99%, maintaining around 96% even at low SNRs (0.5-1).
  • The protocol theoretically extends the secure distance for CV-QKD to about 45 km.
  • Achieved a reconciliation efficiency above 95% with polar codes, outperforming previous SEC schemes.
  • Demonstrated a secret key rate of 7.83×10-3 bits/pulse at 33.93 km (SNR=1), considering finite-size effects.

Conclusions:

  • The RSEC protocol significantly enhances the performance of SEC in CV-QKD systems.
  • RSEC offers improved quantization efficiency and extends the secure communication range.
  • The proposed protocol is a competitive reconciliation scheme for advancing CV-QKD technology.