100 Mbps Reconciliation for Quantum Key Distribution Using a Single Graphics Processing Unit

Abstract

An efficient error reconciliation scheme is important for post-processing of quantum key distribution (QKD). This paper concerns the improvement of reconciliation performance. Recently, a multi-matrix low-density parity-check code-based reconciliation algorithm which can provide remarkable perspectives for high-efficiency information reconciliation was proposed by Gao (Opt Express 27:14545–14566, 2019). The multi-matrix algorithm is implemented and optimized on the graphics processing unit (GPU) to obtain high reconciliation throughput. Experimental results indicate that the GPU-based algorithm can highly improve reconciliation throughput to an average of 85.67 Mbps and a maximum 102.084 Mbps with typical code rate and efficiency. This is the best performance of reconciliation on GPU platform to our knowledge.