Efficient rate-adaptive reconciliation for continuous-variable quantum key distribution

Abstract

Information reconciliation protocol has a significant effect on the secret key rate and maximal transmission distance of continuous-variable quantum key distribution (CV-QKD) systems. We propose an efficient rate-adaptive reconciliation protocol suitable for practical CV-QKD systems with time-varying quantum channel. This protocol changes the code rate of multi-edge type low density parity check codes, by puncturing (increasing the code rate) and shortening (decreasing the code rate) techniques, to enlarge the correctable signal-to-noise ratios regime, thus improves the overall reconciliation efficiency comparing to the original fixed rate reconciliation protocol. We verify our rate-adaptive reconciliation protocol with three typical code rate, i.e., 0.1, 0.05 and 0.02, the reconciliation efficiency keep around 93.5%, 95.4% and 96.4% for different signal-to-noise ratios, which shows the potential of implementing high-performance CV-QKD systems using single code rate matrix.

12 pages, 5 figures

References in corpus (5)

• Fast Quantum Modular Exponentiation
• Quantum NP - A Survey
• Semidefinite programs for completely bounded norms
• 3-Local Hamiltonian is QMA-complete
• Quantum Merlin-Arthur with noisy channel

Cited by in corpus (19)

• Advances in Quantum Cryptography
• Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber
• Towards Large-scale Functional Verification of Universal Quantum Circuits
• Continuous-variable measurement-device-independent quantum key distribution: Composable security against coherent attacks
• Using and reusing coherence to realize quantum processes
• Probabilistic distillation of quantum coherence
• Codes and Protocols for Distilling $T$, controlled-$S$, and Toffoli Gates
• Quantifying the resource content of quantum channels: An operational approach
• Polarization attack on continuous-variable quantum key distribution
• Composable security analysis of continuous-variable measurement-device-independent quantum key distribution with squeezed states for coherent attacks
• Discrete Wigner Formalism for Qubits and Non-Contextuality of Clifford Gates on Qubit Stabilizer States
• Gaussian one-way thermal quantum cryptography with finite-size effects
• Quantifying coherence in terms of the pure-state coherence
• Quantum computational advantage with string order parameters of 1D symmetry-protected topological order
• Advantages and limitations of quantum routing
• Coherence manipulation with dephasing-covariant operations
• Cohering and decohering power of massive scalar fields under instantaneous interactions
• Continuous-variable nonlocality and contextuality
• The Interplay between Quantum Contextuality and Wigner Negativity