Research And Hardware Implementation Of LDPC Reconciliation In QKD Post-processing

With the rise of quantum computing,the classical cryptography is facing unprecedented impact.Due to the powerful computing ability of quantum computing,secure encryption methods based on traditional view are vulnerable,while the proved absolutely safe one-time-pad encryption algorithm has little use for a long time due to its strict requirement of the key.Until the Quantum Key Distribution(QKD)was invented,it makes the absolutely secure encryption possible.QKD post-processing system is the essential part of the QKD system,and the bottleneck of which is Error reconciliation.Theoretical studies indicate that LDPC error reconciliation have many advantages,such as high reconciliation efficiency,good error correction performance and fewer interactions.However its high implementation complexity makes it difficult to achieve high processing speed performed in software,and hardware implementation is the only solution.Firstly,related theory of LDPC error reconciliation are introduced,and the flow of algorithm is presented.We also prove the amount of leaked information by theoretical derivation.Secondly,hardware design parameters are determined via the simulation software,and then we promote a hardware design solution and finish the final implementation.Finally,from the two aspects of functional and performance test,the system performance is higher than other implementations.It's meaningful in the development of high-speed QKD system...