General method for the security analysis in a quantum direct communication protocol

TL;DR

This paper presents a versatile and comprehensive method for analyzing the security of quantum direct communication protocols by examining superoperators and incorporating noise models, enhancing the understanding of eavesdropper information gain.

Contribution

A new general approach for security analysis in quantum communication that unifies noise modeling and quantum discrimination theory.

Findings

Allows incorporation of various noise models

Provides a unified framework for security analysis

Improves estimation of eavesdropper's information gain

Abstract

We introduce a general approach for the analysis of a quantum direct communication protocol. The method is based on the investigation of the superoperator acting on a joint system of the communicating parties and the eavesdropper. The introduced method is more versatile than the approaches used so far as it permits to incorporate different noise models in a unified way. Moreover, it make use of a well grounded theory of quantum discrimination for the purpose of estimating the eavesdropper's information gain.