Explicit anti-degrading channel N_x for depolarizing channel D_x when x >= 1/2 proves zero quantum capacity and gives closed-form capacity of the complementary channel.
Cubitt, Mary Beth Ruskai, and Graeme Smith
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Construction of channels which in every dimension anti-degrade the depolarizing channel
Explicit anti-degrading channel N_x for depolarizing channel D_x when x >= 1/2 proves zero quantum capacity and gives closed-form capacity of the complementary channel.