On the Sufficient Optimality Condition for Quantum Information Processing
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The necessary and sufficient conditions of optimality of the decoding of quantum signals minimizing the Bayesian risk are generalized for the Shannon mutual information criteria. It is shown that for a linear channel with Gaussian boson noise these conditions are satisfied by coherent quasi-measurement of the canonical annihilation amplitudes in the received superposition.
6 pages. An addition to quant-ph/0511042
6 pages. An addition to quant-ph/0511042