Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 22: Quantum Optics I
Q 22.6: Talk
Monday, March 11, 2019, 17:30–17:45, S Gr. HS Maschb.
Macroscopicity of quantum mechanical superposition tests via hypothesis falsification — •Björn Schrinski1, Stefan Nimmrichter2, Benjamin A. Stickler1, and Klaus Hornberger1 — 1Fakultät für Physik, Universität Duisburg-Essen, Duisburg — 2Centre For Quantum Technologies, National University of Singapore
We discuss a macroscopicity measure for quantum superposition tests [1] that quantifies how empirical evidence gathered in a superposition experiment falsifies macrorealistic modifications of quantum mechanics. So far, a quantitative assessment of the macroscopicity has only been formulated for experiments yielding a well-defined interference visibility. We extend this notion of macrosocopicity by establishing a general scheme based on Bayesian hypothesis testing in the parameter space characterizing the macrorealistic modifications. Based on this we assess the macroscopicity reached in recent quantum experiments, i.e. squeezed collective spin states [2], Leggett-Garg-tests [3], and the entanglement between micromechanical oscillators [4,5].
[1] S. Nimmrichter and K. Hornberger, Phys. Rev. Lett. 110, 160403 (2013)
[2] T. Berrada et al., Nat. Commun. 4, 2077 (2013)
[3] C. Robens et al., Phys. Rev. X 5, 011003 (2015)
[4] R. Riedinger et al., Nature 556, 473-477 (2018)
[5] C.F. Ockeloen-Korppi et al., Nature 556, 478-482 (2018)