Dr. John F. Clauser

John Francis Clauser is an American experimental and theoretical physicist. He is best known for his contributions to the foundations of quantum mechanics, in particular for the Clauser-Horne-Shimony-Holt (CHSH) inequality, for the first experimental proof that non-local quantum entanglement is real (Freedman-Clauser), and for the formulation of the theory of Local Realism (Clauser-Horne).

Together with the 1969 CHSH prediction, the 1972 Freedman-Clauser experiment is deemed sufficiently important that it has now been repeated by others, literally hundreds of times in a wide variety of configurations, at many laboratories around the world. It is now commonly performed by students in undergraduate laboratories as a part of a standard physics curriculum. It is also widely considered to be for quantum mechanics, what the Michelson-Morley experiment is for special relativity.