153 research outputs found
Physical Meaning of the Optimum Measurement Process in Quantum Detection Theory
The optimum measurement processes are represented as the optimum detection operators in the quantum detection theory. The error probability by the optimum detection operators goes beyond the standard quantum limit automatically. However the optimum detection operators are given by pure mathematical descriptions. In order to realize a communication system overcoming the standard quantum limit, we try to give the physical meaning of the optimum detection operators
Derivation of classical capacity of quantum channel for discrete information source
In this letter, we prove that the classical capacity of quantum channel for
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.Comment: 9 pages, RevTeX, 3 figures(EPSF
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