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Derivation of classical capacity of quantum channel for discrete information source

Kentaro Kato, Masao Osaki, Osamu Hirota

quant-pharXiv:quant-ph/9811085

Abstract

In this letter, we prove that the classical capacity of quantum channel for M symmetric states is achieved by an uniform distribution on a priori probabilities. We also investigate non-symmetric 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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