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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 introduction of axiomatic observables. The conventional (collapse) and the Everett interpretations of quantum theory may in principle lead to different dynamical consequences. Finally, a formal ensemble description not(More)
Quantum theory does not require the existence of discontinuities: neither in time (quantum jumps), nor in space (particles), nor in spacetime (quantum events). These apparent discontinuities are readily described objectively by the continuous process of decoherence occurring locally on a very short time scale according to the Schršdinger equation for(More)
This is a brief reply to S. Goldstein's article "Quantum theory without observers" in Physics Today. It is pointed out that Bohm's pilot wave theory is successful only because it keeps Schrodinger's (exact) wave mechanics unchanged, while the rest of it is observationally meaningless and solely based on classical prejudice. In his recent article on "Quantum(More)
A short critical review of the concept of decoherence, its consequences, and its possible implications for the interpretation of quantum mechanics is given. There seems to be some confusion in the literature not only on what may actually be achieved by decoherence, but also on how this concept has to be defined. I will here " consistently " use it in terms(More)
The appearance of spinor fields as operators or arguments of field functionals in quantum field theory is often regarded as a second quantization, since fermion wave functions were themselves discovered by quantizing mass points (" particles "). I argue that this language, though reflecting the historical development, is misleading. Field amplitudes always(More)
The conceptual and dynamical aspects of decoherence are analyzed, while their consequences are discussed for several fundamental applications. This mechanism, which is based on a universal Schrödinger equation, is furthermore compared with the phenomenological description of open systems in terms of 'quantum dynamical maps'. Decoherence is usually defined(More)
Schrödinger's wave function shows many aspects of a state of incomplete knowledge or information (" bit "): (1) it is usually defined on a space of classical configurations, (2) its generic entanglement is, therefore, analogous to statistical correlations, and (3) it determines probabilities of measurement outcomes. Nonetheless, quantum superpositions (such(More)
The superposition principle forms the most fundamental kinematical concept of quantum theory. Its universality seems to have first been postulated by Dirac as part of the definition of his " ket-vectors " , which he proposed as a complete 1 and general concept to characterize quantum states regardless of any basis of representation. They were later(More)