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

Johannes Kofler, Caslav Brukner

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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 classical Newtonian laws emerge out of the Schro¿dinger equation and the projection postulate. © 2007 The American Physical Society.
Original languageEnglish
Article number180403
Number of pages4
JournalPhysical Review Letters
Issue number18
Publication statusPublished - 2007

Austrian Fields of Science 2012

  • 1030 Physics, Astronomy

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