Showing papers on "Quantum channel published in 1980"
01 Jan 1980
4 citations
TL;DR: The recent issues surrounding the feasibility of greatly improved far-field optical communication via the use of nonclassical quantum states are analyzed.
Abstract: The recent issues surrounding the feasibility of greatly improved far-field optical communication via the use of nonclassical quantum states are analyzed.
2 citations
2 citations
TL;DR: In this paper, the authors examined the existence of longitudinal limitations of measurability, defined as limitations preventing the measurement of a given quantity with arbitrarily high accuracy, and they considered a measuring device as a generalized communication system.
Abstract: We examine the problem of the existence (in classical and/or quantum physics) of longitudinal limitations of measurability, defined as limitations preventing the measurement of a given quantity with arbitrarily high accuracy. We consider a measuring device as a generalized communication system, which enables us to use methods of information theory. As a direct consequence of the Shannon theorem on channel capacity, we obtain an inequality which limits the accuracy of a measurement in terms of the average power necessary to transmit the information content of the measurement itself. This inequality holds in a classical as well as in a quantum framework.