title: Macroscopicity of mechanical quantum superposition states.
abstract: We propose an experimentally accessible, objective measure for the macroscopicity of superposition states in mechanical quantum systems. Based on the observable consequences of a minimal, macrorealist extension of quantum mechanics, it allows one to quantify the degree of macroscopicity achieved in different experiments.
authors.affiliation: Vienna Center for Quantum Science and Technology (VCQ), Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.
authors.forename: Stefan
authors.initials: S
authors.lastname: Nimmrichter
authors.forename: Klaus
authors.initials: K
authors.lastname: Hornberger