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The Holevo-Schumacher-Westmoreland (HSW) classical (entanglement-unassisted)channel capacity for a class of qudit unital channels is shown to be C =log2(d) - Smin, where d is the dimension of the qudit, and Smin is the minimumpossible von Neumann entropy at the channel output. The HSW channel capacityfor tensor products of this class of unital qudit channels is shown to obey thesame formula.Comment: 21 Pages. No Figure

Holevo-Schumacher-Westmoreland channel capacity for a class of qudit unital channels