Additivity of minimal entropy output for a class of covariant channels

M. Fannes, B. Haegeman, M. Mosonyi +1

Additivity of minimal entropy output is proven for the class of quantum channels ${\Lambda }_t(A):=t{A}^T+(1-t)\tau (A)$ in the parameter range $-2/(d^2-2)\le t\le 1/(d+1)$.