Showing papers on "Coherent information published in 1973"
TL;DR: In this paper, the conditional entropy between two states of a quantum system is shown to be nonincreasing when a complete measurement is performed on the system, and the information between two quantum systems is defined and bounded above by the logarithmic correlation.
Abstract: The conditional entropy between two states of a quantum system is shown to be nonincreasing when a complete measurement is performed on the system. The information between two quantum systems is defined and is shown to be bounded above by the logarithmic correlation. This inequality is then applied to the measurement process. The entropy changes in the observed system and the measuring apparatus are compared with the information gain in the measurement.
343 citations
TL;DR: In this article, the program of a physical concept of information is outlined in the framework of quantum theory and a proposal is made for how to avoid the intuitive introduction of observables.
Abstract: The program of a physical concept of information is outlined in the framework of quantum theory. A proposal is made for how to avoid the intuitive introduction of observables. The conventional and the Everett interpretations in principle may lead to different dynamical consequences. An ensemble description occurs without the introduction of an abstract concept of information.
166 citations
TL;DR: In this article, the authors examined the conditions which a given information must satisfy in order to determine a unique quantum state with maximum information entropy in the information theory approach to quantum statistics.
Abstract: In the frame of the information theory approach to quantum statistics, we examine the conditions which a given information “Tr(WA) =m” must satisfy in order to determine a unique quantum state with maximum information entropy.
10 citations
Proceedings Article•
20 Aug 1973TL;DR: The architecture of a metasystem is discussed, which can be used to generate intelligent information systems for different domains of discourse and points out the kinds of knowledge accepted by the system, and the way the knowledge is used to do nontrivial problem solving.
Abstract: This paper discusses the architecture of a meta-system, which can be used to generate intelligent information systems for different domains of discourse. It points out the kinds of knowledge accepted by the system, and the way the knowledge is used to do non-trivial problem solving. The organization of the system makes it possible for it to function in the context of a large and expanding data base. The meta-system provides a basis for the definition of the concept of machine understanding in terms of the models that the machine can build in a domain, and the way it can use the models.
2 citations
01 Jan 1973
TL;DR: A model of quantum noisy channel with input encoding by a classical random vector is described and the optimal decoding in this case realizes the maximum amount I = Spln � 1+S=(N+1) � of the classical information as trans.
Abstract: A model of quantum noisy channel with input encoding by a classical random vector is described. An equation of optimality is derived to determine a complete set of wave functions describing quantum decodings based on quasi-measurements maximizing the classical amount of transmitted information. A solution of this equation is found for the Gaussian multimode case with input Gaussian distribution. It is described by the overcomplete family of coherent vectors describing an optimal quasimeasurement of the canonical annihilation amplitudes in the output Hilbert space. It is found that the optimal decoding in this case realizes the maximum amount I = Spln � 1+S=(N+1) � of the classical information as trans