General method for the security analysis in a quantum direct communication protocol
This work addresses security analysis for quantum communication protocols, but it appears incremental as it builds on existing quantum discrimination theory to enhance versatility.
The authors tackled the problem of analyzing security in quantum direct communication protocols by introducing a general method based on superoperators and quantum discrimination theory, which allows for unified noise model incorporation and estimation of eavesdropper information gain.
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.