Decoy-state quantum key distribution with two-way classical post-processing

摘要

Decoy states have recently been proposed as a useful method for substantially improving the performance of quantum key distribution (QKD) protocols when a coherent state source is used.Previously, data post-processing schemes based on one-way classical communications were considered for use with decoy states. In this paper presentation, we talk about two data post-processing schemes for the decoy-state method using two-way classical communications. Our numerical simulation (using parameters from a specific QKD experiment as an example) scheme is able to extend the maximal secure distance from 142km (using only one-way classical communications with decoy states) to 181km. The second scheme is able to achieve a 10% greater key generation rate in the whole regime of distances. We conclude that decoy state QKD with two-way classical post-processing is of practical interest.