Abstract
Quantum key distribution (QKD) protocol mainly includes two stages: signal transmission stage based on quantum channel and post-processing stage based on classical channel, and the post-processing stage has gradually become a bottleneck restricting the high performance of QKD. Information reconciliation (IR) is a key step in post-processing. Cascade has been widely used in IR due to its excellent error correction performance. In this study, we analyze original Cascade and adjust parameters to improve the partition strategy. As a result, more errors are corrected under near-optimal conditions. We consider both reconciliation efficiency and frame error rate to measure protocol performance. Simulation shows that the improved Cascade can effectively improve the reconciliation efficiency while ensuring a small frame error rate. Overall, our improved Cascade has better performance on the final secret key rate.
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