Chun-Mei Zhang

At present, the performance of quantum digital signatures (QDSs) is limited by key generation protocols (e.g., BB84 or measurement-device-independent protocols), which are fundamentally limited in terms of channel capacity. Fortunately, the recently proposed twin-field quantum key distribution can overcome this limit. Here, we for the first time propose a twin-field QDS (TF-QDS) protocol and give a corresponding security analysis. It can not only possess the highest security among all existing QDS protocols, but also exhibit outstanding performance in terms of both signature rates and secure transmission distances. Therefore, our work represents another step towards practical implementation of QDSs.