@article{d07ae14e6a82413c90673f967e995568,
title = "Experimental Limits of Ghost Diffraction: Popper{\textquoteright}s Thought Experiment",
abstract = "Quantum ghost diffraction harnesses quantum correlations to record diffraction or interference features using photons that have never interacted with the diffractive element. By designing an optical system in which the diffraction pattern can be produced by double slits of variable width either through a conventional diffraction scheme or a ghost diffraction scheme, we can explore the transition between the case where ghost diffraction behaves as conventional diffraction and the case where it does not. For conventional diffraction the angular extent increases as the scale of the diffracting object is reduced. By contrast, we show that no matter how small the scale of the diffracting object, the angular extent of the ghost diffraction is limited (by the transverse extent of the spatial correlations between beams). Our study is an experimental realisation of Popper{\textquoteright}s thought experiment on the validity of the Copenhagen interpretation of quantum mechanics. We discuss the implication of our results in this context and explain that it is compatible with, but not proof of, the Copenhagen interpretation.",
author = "Moreau, {Paul Antoine} and Morris, {Peter A.} and Ermes Toninelli and Thomas Gregory and Aspden, {Reuben S.} and Gabriel Spalding and Boyd, {Robert W.} and Padgett, {Miles J.}",
note = "Funding Information: This work was funded by the UK Engineering and Physical Sciences Research Council (QuantIC EP/M01326X/1) and the European Research Council (TWISTS, 340507, Grant no. 192382). P.-A.M. acknowledges the support from the European Union{\textquoteright}s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 706410. RWB acknowledges support through the Natural Sciences and Engineering Research Council of Canada, the Canada Research Chairs program and the Canada First Research Excellence Fund. ET acknowledges the financial support from the EPSRC Centre for Doctoral Training in Intelligent Sensing and Measurement (EP/L016753/1). T.G. acknowledges the financial support from the EPSRC (EP/N509668/1) and the Professor Jim Gatheral quantum technology studentship. PAM acknowledges the support from the UK EPSRC. Publisher Copyright: {\textcopyright} 2018, The Author(s).",
year = "2018",
month = dec,
day = "1",
doi = "10.1038/s41598-018-31429-y",
language = "English",
volume = "8",
journal = "Scientific reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
number = "1",
}