Showing papers on "Coherent information published in 1987"
TL;DR: An information theoretical structure of one-dimensional maps is investigated by regarding the maps as a “channel” rather than a ”source”, such that initially localized information spreads over whole system as time passes.
62 citations
01 Jan 1987
TL;DR: In this article, the entropy defect and Shannon's measure of information are introduced and formulated for both quasiclassical and consistently quantum description of a physical system, and the physical meaning of both quantities is analyzed in connection with Gibbs paradox and the maximum work obtainable from a nonequilibrium system.
Abstract: Basic concepts and results of physical information theory are presented. The entropy defect and Shannon’s measure of information are introduced and the entropy defect principle is formulated for both quasiclassical and consistently quantum description of a physical system. Results related to ideal physical information channels are discussed. The entropy defect and the amount of information coincide in the quasiclassical case, but the latter quantity is, in general, smaller than the former in quantum case due to the quantum-mechanical irreversibility of measurement. The physical meaning of both quantities is analyzed in connection with Gibbs paradox and the maximum work obtainable from a non-equilibrium system. Indirect (generalized) vs. direct (von Neumann’s) quantum measurements are considered. It is shown that in any separable infinite-dimensional Hilbert space direct and indirect quantum measurements yield equal maximum information.
21 citations