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B. Schrinski, S. Nimmrichter, B. A. Stickler, and K. Hornberger
Macroscopicity of quantum mechanical superposition tests via hypothesis falsification
Phys. Rev. A 100, 032111 (2019)


We establish an objective scheme to determine the macroscopicity of quantum superposition tests with mechanical degrees of freedom. It is based on the Bayesian hypothesis falsification of a class of macrorealist modifications of quantum theory, such as the model of continuous spontaneous localization. The measure uses the raw data gathered in an experiment, taking into account all measurement uncertainties, and can be used to directly assess any conceivable quantum mechanical test. We determine the resulting macroscopicity for three recent tests of quantum physics: double-well interference of Bose-Einstein condensates, Leggett-Garg tests with atomic random walks, and entanglement generation and read-out of nanomechanical oscillators.

(18 pages, 7 figures)   [pdf, journal, arXiv:1902.11092]

doi:10.1103/PhysRevA.100.032111            (c) The American Physical Society