Practical decoy-state quantum digital signature with optimized parameters

Abstract

Quantum digital signature (QDS) can guarantee the authenticity and transferability of messages through quantum theory, and is becoming an interesting topic in the field of quantum information. Various protocols have been put forward to make QDS more practical and efficient. However, in previous QDS works, only fixed parameters have been utilized due to the high time complexity of optimizing parameters. In this paper, we solve this technical problem by developing a framework of minimizing the number of quantum pulses given a certain security level, and for the first time implement the parameter optimization method onto practical decoy-state QDS systems. Simulation results indicate that decoy-state QDS with optimized parameters can present improved performance both in the signature rate and transmission distance than previous works with fixed parameters, making it very promising in possible digital signature scenarios.