Improved finite-size analysis for measurement-device-independent quantum digital signature

TL;DR

This paper improves the finite-size analysis in measurement-device-independent quantum digital signatures by proposing two new parameter estimation models, which enhance performance and signature rate in practical quantum communication.

Contribution

It introduces two novel models for finite-size analysis in MDI-QDS, outperforming previous methods and reducing finite-size effects.

Findings

Proposed two new finite-size analysis models for MDI-QDS

Numerical simulations show improved signature rate

Models are less affected by finite-size effects

Abstract

Quantum digital signatures (QDS), based on the principles of quantum mechanics, provide information-theoretic security, ensuring the integrity, authenticity, and non-repudiation of data transmission. With present QDS protocols, measurement-device-independent QDS (MDI-QDS) can resist all attacks on detections, yet it suffers from finite-size effect. In this work, we present and compare three parameter estimation models for finite-size analysis of two-decoy MDI-QDS. The first model is a commonly used model in previous schemes, and we propose two new models to improve the performance. Subsequently, we perform numerical simulations to evaluate the performance of the three models. The results demonstrate that the proposed methods are less affected by finite-size effect, thereby effectively enhancing the signature rate. This work contributes to the practical development of QDS.