On estimating the output entropy of the tensor product of a phase-damping channel and an arbitrary channel
We obtain a lower estimate for the output entropy of a tensor product of the quantum phase-damping channel and an arbitrary channel. We show that this estimate immediately implies that strong superadditivity of the output entropy holds for this channel as well as for the quantum depolarizing channel.
Unable to display preview. Download preview PDF.
- 7.Amosov, G.G., Holevo, A.S., and Werner, R.F., On the Additivity Conjecture in Quantum Information Theory, Probl. Peredachi Inf., 2000, vol. 36, no. 4, pp. 25–34 [Probl. Inf. Trans. (Engl. Transl.), 2000, vol. 36, no. 4, pp. 305–313].Google Scholar