CASCADE as Correlation Enhancer for CVQKD Protocols

We propose a secret key reconciliation approach for CVQKD information reconciliation based on CASCADE protocol, which works as a correlation enhancer, in order to ensure a better utilization of binary quantized sequences from CVQKD protocols. We make a probabilistic analysis of the initial block size in order to control the expected value of the corrected errors in the first step of CASCADE and to bound the amount of information leaked. Our method achieved significant enhancements on binary sequences with BER<0.35 and improved sequences with BER>0.35 to became eligible for information reconciliation.