Abstract
In this paper, a new direct quantum communication protocol based on a modified spin coherent state as decoy particles is to be depicted, before that both the scheme of the communication and the modified spin coherent state of the $$SU(2)$$ group will be presented. The final phase is to be devoted to the study of the transmission security analysis and the quantity information depending on the method of the entropy theory, using the constraint between the information which can be obtained by the eavesdropper and the occurring interference.
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