The first chapter offers an introduction, intended for a reader who approaches quantum physics for the first time. The appearance of relative classical worlds in the quantum UniverseĪbout this book Summary.Thus conceived quantum theory of observation is another name for Everett's theory, also called the many-worlds interpretation, the theory of the universal wave function, or the "relative state" formulation of quantum mechanics, because by applying the Schrödinger equation to observation processes, we obtain solutions that represent the multiple destinies of observers and their relative worlds. The quantum theory of observation invites us to give up the postulate of the wave function collapse, because it is not necessary to explain the correlations between successive observations, and because it contradicts the Schrödinger equation. Therefore, the number of components does not change the quantum nature of a system. 2.1, third principle of quantum physics). This universality is a direct consequence of the principles: if two quantum systems are combined, they together form a new quantum system (cf. They apply to all material, microscopic and macroscopic, systems. This requirement is not justified because quantum laws are universal. It differs from the usual interpretations of quantum mechanics (Niels Bohr, Copenhagen interpretation) which require that the measuring apparatus be considered as a classical system, which does not obey quantum physics. This theoretical approach was initiated by John von Neumann (1932). The measurement process is determined by their interaction and is described by a unitary evolution operator. Both the observed system and the observer system (the measuring apparatus) are considered as quantum systems. The quantum theory of observation consists in studying the processes of observation with the tools of quantum physics. The computed quantum presence (wave function) of an initially very localized particle.
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