Decoherence, basic concepts and interpretation by Zeh.

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Similar arguments hold for “quantum teleportation”, where an appropriate nonlocal state that contains the state to be ported as a component has to be well prepared (cf. also Vaidman 1998). Experiments clearly support this view of a continuous evolution instead of quantum jumps (cf. Fearn, Cock, and Milonni 1995). Teleportation would be required if reality were local and physical properties entered existence “out of the blue” in fundamental quantum events. Therefore, this whole concept is another artifact of the Copenhagen interpretation.

This approach can not explain the appearance of proper mixtures unless it is meant to postulate a fundamental correction to the Schr¨ odinger equation. The formal theory of master equations will be discussed in Chap. 7 (see also Zeh 2001). Their approximate foundation in terms of a global unitary Schr¨ odinger equation requires very specific (statistically improbable) cosmic initial conditions. According to a universal Schr¨ odinger equation, quantum correlations with the environment are permanently created with great efficiency for all macroscopic systems, thus leading to decoherence, defined as the irreversible dislocalization of phase relations (see Chap.

38 H. D. Zeh declare the program of decoherence a failure. As explained in Sect. 3, both claims miss the point. However, decoherence represents a crucial dynamical step in the measurement process. The rest may remain a pure epistemological problem (requiring only a reformulation of the psycho-physical parallelism in consistent quantum mechanical terms). If the Schr¨odinger equation is exact, the observed quantum indeterminism can only reflect that of the observer’s identity – not one to be found in objective dynamics.

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