Classical world arising out of quantum physics under the restriction of coarse-grained measurements

Details Classical world arising out of quantum physics under the restriction of coarse-grained measurements Classical world arising out of quantum physics under the restriction of coarse-grained measurements

2006-09-11

arxiv.org/abs/quant-ph/0609079v3

Phys. Rev. Lett. 99, 180403 (2007)

Physics

Quantum Physics

4 pages, 1 figure, second revised and published version

Scientific paper

10.1103/PhysRevLett.99.180403

Conceptually different from the decoherence program, we present a novel theoretical approach to macroscopic realism and classical physics within quantum theory. It focuses on the limits of observability of quantum effects of macroscopic objects, i.e., on the required precision of our measurement apparatuses such that quantum phenomena can still be observed. First, we demonstrate that for unrestricted measurement accuracy no classical description is possible for arbitrarily large systems. Then we show for a certain time evolution that under coarse-grained measurements not only macrorealism but even the classical Newtonian laws emerge out of the Schroedinger equation and the projection postulate.

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