Fig. 4
From: Quasi-cyclic multi-edge LDPC codes for long-distance quantum cryptography
GPU information throughput \(K_{{\mathrm{GPU}}}^\prime\) of the q = 21 QC-LDPC code with d = 8 dimensional reconciliation up to the maximum distance point for β ∈ {0.80, 0.88, 0.92, 0.96, 0.98, 0.99}, and upper bound on secret key rate for a lossy channel \(K_{{\mathrm{lim}}}^\prime\) vs. distance. Here we show that the GPU information throughput \(K_{{\mathrm{GPU}}}^\prime\) is higher than the tight upper bound on secret key rate at the maximum distance point for each β-efficiency using a single NVIDIA GeForce GTX 1080 GPU. Thus, the speed of key reconciliation in the post-processing step is no longer a bottleneck in CV-QKD
