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It was shown [T.S. Cubitt et al., IEEE Trans. Inform. Theory 57, 8114 (2011)]that there exist quantum channels where a single use cannot transmit classicalinformation perfectly yet two uses can. This phenomenon is called thesuperactivation of the zero-error classical capacity which does not occur inclassical channels. In this paper, it is shown that qubit channels cannotgenerate the superactivation.

Zero-error classical capacity of qubit channels cannot be superactivated