Experimental quantum digital signature based on heralded single-photon sources
摘要
The quantum digital signature (QDS) has become a popular research topic in the field of quantum information, due to its information-theoretic security on signing signatures. However, weak coherent sources are often utilized as light sources in most previous QDS protocols, resulting in relative limited secure transmission distance. Here, we propose a four-intensity decoy-state QDS scheme based on heralded single-photon sources (HSPS) and present a concise security analysis in the finite-size scenario. Furthermore, we carry out corresponding experimental demonstrations, and successfully sign messages at 14.4 dB and 24.4 dB, verifying the good performance of implementing QDS with HSPS.