Editing Bell test (section)

=== Kasday, Ullman and Wu (1970) ===
[[Leonard Ralph Kasday]], [[Jack R. Ullman]] and [[Chien-Shiung Wu]] carried out the first experimental Bell test, using photon pairs produced by [[positronium]] decay and analyzed by [[Compton scattering]]. The experiment observed photon polarization correlations consistent with quantum predictions and inconsistent with local realistic models that obey the known polarization dependence of Compton scattering. Due to the low polarization selectivity of Compton scattering, the results did not violate a Bell inequality.<ref>{{cite conference |title=Experimental test of quantum predictions for widely separated photons |last1=Kasday |first1=Leonard |author-link1= |last2= |first2= |author-link2= |date=1971 |publisher=Academic Press, New York |book-title= |pages=195–210 |location=Como, Italy |conference=Proceedings of the International School of Physics “Enrico Fermi.” Course 49: Foundations of quantum mechanics |id= |editor = Bernard d'Espagnat |url=https://en.sif.it/books/series/proceedings_fermi}}</ref><ref>{{cite thesis |degree=PhD |last=Kasday |first=Leonard Ralph |date=1972 |title=The distribution of Compton scattered annihilation photons, and the Einstein-Podolsky-Rosen argument |publisher=Columbia University|doi=10.7916/5q2y-3494 |url=https://doi.org/10.7916/5q2y-3494}}</ref>