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arXiv:2309.06962

Quantum non-locality: from denigration to the Nobel prize, via quantum cryptography

Nicolas Gisin

Published Sep 13, 2023• 0 citations
arXivHTMLPDF

Abstract

In the late 1960s, a young physicist was sailing along the coast of California towards Berkeley, where he got a post-doc position in astronomy. But his real goal was not astronomy, at least not immediately. First, John Clauser eagerly wanted to test some predictions of quantum theory that were at odds with a then recent and mostly ignored result by an Irish physicist John Stewart Bell, working at the celebrated CERN near Geneva.

DOI
10.48550/arxiv.2309.06962

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In the late 1960s, a young physicist was sailing along the coast of California towards Berkeley, where he got a post-doc position in astronomy. But his real goal was not astronomy, at least not immediately. First, John Clauser eagerly wanted to test some predictions of quantum theory that were at odds with a then recent and mostly ignored result by an Irish physicist John Stewart Bell, working at the celebrated CERN near Geneva.
During the 1960s, Bell produced his seminal work on the foundations of quantum theory, first showing that, contrary to von Neumann’s argument, hidden variable theories were allowed but then that they had to be non-local. Thus, he showed that quantum theory did not respect local causality, and he outlined experiments that could be used to test whether the assumption of local realism was true in quantum theory: Bell’s theorem, or Bell’s inequality, or Bell’s inequalities. His work was followed up by John Clauser, Abner Shimony, Michael Horne, and Richard Holt, who produced the CHSH inequality. Bell had moved to CERN, where he worked on the theory of neutrino experiments, and on nuclear and elementary particle physics, making crucial suggestions concerning the use of gauge theory for each type of physical force and also producing the Adler–Bell–Jackiw anomaly, or the ABJ anomaly.
Abstract It is probably reasonable to suppose that the derivation, in the late 1960s and early 1970s, of an equation that is demonstrably violated by a quantum theory then over 40 years old should have settled the matter one way or the other, once and for all. Correlated quantum particles are everywhere in physics and chemistry, the simplest and most obvious example being the helium atom, an understanding of the spectroscopy of which had led to the introduction of the Pauli principle in the first place. But it became apparent that the special circumstances under which Bell’s inequality could be subjected to experimental test had never been realized in the laboratory. Suddenly, the race was on to perfect an apparatus that could be used to perform the necessary measurements on pairs of correlated quantum particles.
Walking through the guarded gate of CERN. a center for peaceful atomic research near Geneva, Switzerland, one finds oneself in what seems to be a typical industrial park Upon coming to thefirst corner, one has a sense of the surreal tofind pleasant signs marking it as the intersection of Einstein and W. Pauli streets. Ambling along a bit further, one comes to a quiet, treeshaded building housing the office of theoretical physicist, John Stewart Bell, whose work on “nonlocality” is regarded by some as fermenting yet another conceptual revolution in our world view. With an almost shy Irish brogue from his native Dublin, however, Bell modestly disavows any such significance to what is called “Bell's Inequality” in the literature of quantum physics. In this interview, our editor queried Bell on the relevance of his work for Jung's view of synchronicity as a non- causal factor in human affairs. Bell cautions that everything he says here is only his “opinion of the mystery and muddle of it all.”
Experimenter bias compromises the integrity and advancement of science, especially when awarded as such. For example, the 2022 Nobel Prize in Physics awarded for the loophole-free experiments that tested physicist John S. Bell's inequality theorem. These experiments employed the logic of conducting local experiments to obtain local evidence that contradicted local realistic theories of nature, thereby validating quantum mechanics as a fundamental non-local theory. However, there was one loophole that was wittingly not tested by the Nobel laureates. The notable exception was Bell's "super-deterministic" loophole, which was validated (2000) (2001) (2002) (2003) (2004) (2005) (2006) (2007) (2008) (2009) (2010) (2011) (2012) non-locally, thus compromising the subsequent Nobel Prize. More importantly, the discovery of two mutually exclusive and jointly exhaustive non-local hidden variables revealed why local scientific methods obtain false-positive and false-negative results. With knowledge of this fundamental omission, the inclusion of the non-local hidden variables in the local methods used in science can then advance it to be a complete study of nature.