Continuous-Variable QKD with key rates far above Devetak-Winter

Continuous-Variable Quantum Key Distribution (CVQKD) at large distances has such high noise levels that the employed error-correcting codes must have very low rate. In this regime it becomes feasible to implement random-codebook error correction, which is known to perform close to capacity. We propose a random-codebook reverse reconciliation scheme for CVQKD that is inspired by spread-spectrum watermarking. Our scheme has a novel way of achieving statistical decoupling between the publicly sent reconciliation data and the secret key. We provide a …

continuous cs.cr distribution error far high key large low noise qkd quant-ph quantum quantum key distribution random rate reverse variable winter