By Erich Joos
A particular description of the phenomena that come up from the interplay among quantum structures and their setting. a result of novel personality of the procedure mentioned, the booklet addresses scientists from all fields of physics and comparable disciplines in addition to scholars of physics.
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Extra resources for Decoherence and the Appearance of a Classical World in Quantum Theory
The quantum state diffusion model (see Gisin and Percival 1992) is claimed to represent effects caused by the environment (and would then have to be equivalent to environmental decoherence), but it describes them only phenomenologically as a local collapse. For this reason it will be discussed in Chap. 8. In this respect it is similar to Mensky's early approach in terms of "restricted path integrals" (Mensky 1979a,b), although this was later clearly identified as decoherence (see Mensky 1993a).
D. Zeh 26 different decay times. From the point of view of a local observer, the system may be assumed to have decayed at a certain time (within the usually very narrow limits set by the decoherence time scale - see Sect. 2), even though he may not have observed it. This situation does not allow coherent state revival any more, and it leads instead to an essentially exact exponential decay law shortly after the decaying state has been produced (see Joos 1984). 2)) .. 5) n he could as well assume (from his subjective point of view) that the nonlocal superposition still exists.
Decoherence Through Interaction with the Environment 37 means of its density matrix. The local density matrix, which contains the complete information for the (probabilities of) the results of all measurements that can be performed at this system, will therefore be the central subject throughout this section. We will often use the term "local" as a synonym for "subsystem". In classical physics objects are considered distinct if they occupy different positions in space. But even in classical mechanics such a property is not invariant under canonical transformations.
Decoherence and the Appearance of a Classical World in Quantum Theory by Erich Joos