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An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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A novel error correction protocol for continuous variable quantum key distribution.

Kadir Gümüş1,2, Tobias A Eriksson3,4, Masahiro Takeoka3

  • 1Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, 5600MB, The Netherlands. kadir.guemues@kit.edu.

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|May 18, 2021
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Summary
This summary is machine-generated.

We introduce a multiple decoding attempts (MDA) protocol for continuous-variable quantum key distribution (CV-QKD) reconciliation. This method enhances the secret key rate (SKR) by reducing frame errors with multiple LDPC code decoding attempts.

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Quantum Communication Systems

Background:

  • Reconciliation is crucial for continuous-variable quantum key distribution (CV-QKD) performance and complexity.
  • Conventional CV-QKD reconciliation uses low-density parity-check (LDPC) codes with a single decoding attempt.

Purpose of the Study:

  • To propose and evaluate a modified reconciliation protocol for four-state CV-QKD systems.
  • To enhance the secret key rate (SKR) and reduce frame error rates in CV-QKD.

Main Methods:

  • Introduction of the multiple decoding attempts (MDA) protocol.
  • Utilizing LDPC codes with multiple, shorter decoding iterations per attempt.
  • Revealing information bits between decoding attempts to lower the effective code rate.
  • Implementing an early termination strategy for the LDPC decoder.

Main Results:

  • The MDA protocol demonstrated a 10% decrease in frame error rate.
  • An 8.5% increase in the secret key rate (SKR) was achieved compared to the conventional protocol.
  • MDA with early termination maintained decoding complexity similar to the conventional method.

Conclusions:

  • The proposed MDA protocol offers a significant improvement in CV-QKD performance.
  • MDA enhances SKR and reduces frame errors without increasing computational complexity.
  • This modified reconciliation strategy is a promising advancement for secure quantum communication.