Related Experiment Video
Updated: Jul 24, 2025

Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
Rate-Compatible LDPC Codes for Continuous-Variable Quantum Key Distribution in Wide Range of SNRs Regime
Xiaodong Fan1,2, Quanhao Niu1,2, Tao Zhao1,2
1Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 510006, China.
Abstract:
Long block length rate-compatible low-density parity-compatible (LDPC) codes are designed to solve the problems of great variation of quantum channel noise and extremely low signal-to-noise ratio in continuous-variable quantum key distribution (CV-QKD). The existing rate-compatible methods for CV-QKD inevitably cost abundant hardware resources and waste secret key resources. In this paper, we propose a design rule of rate-compatible LDPC codes that can cover all potential SNRs with single check matrix. Based on this long block length LDPC code, we achieve high efficiency continuous-variable quantum key distribution information reconciliation with a reconciliation efficiency of 91.80% and we have higher hardware processing efficiency and lower frame error rate than other schemes. Our proposed LDPC code can obtain a high practical secret key rate and a long transmission distance in an extremely unstable channel.
Related Concept Videos
Propagation of Uncertainty from Random Error
Propagation of Uncertainty from Systematic Error
Receiver Operating Characteristic Plot
BIBO stability of continuous and discrete -time systems
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
Extraction: Partition and Distribution Coefficients
For extracting a solute from an aqueous phase into an...
Sampling Continuous Time Signal
In the...

