Information - the Fundamental Notion of Quantum Theory

Abstract

In this article a notion of information is presented which stresses the contextuality of quantum objects and their measurement. Mathematically this is reached by a quantification of the quantum mechanical surplus knowledge which has been introduced by Weizsacker. This new formulation gives insight into relation between single quantum objects and ensembles of quantum objects. The goal is to provide an explanatory concept for teaching purposes, the description of quantum processes and measurement with aid of information.