Derivation of classical capacity of a quantum channel for a discrete information source |
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Affiliation: | Research Center for Quantum Communications, Tamagawa University, Tamagawa-Gakuen 6-1-1, Machida, Tokyo 194-8610, Japan |
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Abstract: | We prove that the classical capacity of a quantum channel for M symmetric states is achieved by a uniform distribution on a priori probabilities. We also investigate nonsymmetric cases such as a ternary amplitude shift keyed signal set and a 16-ary quadrature amplitude modulated signal set in coherent states. |
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