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In the theory of quantum communications, a deeper structure has been recently unveiled -- mainly within the physics community -- showing that the capacity does not completely characterize the channel ability to transmit information due to phenomena -- namely, superadditivity, superactivation, and causal activation -- with no counterpart in the classical world. Although how deep goes this structure is yet to be fully uncovered, it is crucial for the communication engineering community to own thearXiv:2108.07108v2 fatcat:iueaihzrjvhlfongjbsqmc3q7u