On the generalization and improvement of QSDC efficiency achieved through a quantum channel compression
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The paper presents a complete and general representation of the overall efficiency expression for the quantum secure direct communication (QSDC) protocol that relies on quantum channel compression (QCC). For this purpose, (i) the encoding technique, respectively, QCC is generalized—QCCs of higher order are introduced; (ii) the data statistics of the messages to be transferred are incorporated into the overall efficiency expression. An analysis is made concerning the behavior and the extent of the overall efficiency. It is justified that QSDC protocols, which are based on high order of QCC, could achieve efficiencies that have never been reached before.
KeywordsQuantum cryptography Quantum secure communication Quantum channel compression Quantum secure direct communication efficiency
The work is supported by the projects ДН07/10-2016 and ПД01/05-2018, funded by National Science Fund, Ministry of Education and Science, Bulgaria.
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