Bell non-locality in macroscopic systems

Dalton, B.J. (2019) Bell non-locality in macroscopic systems. European Physical Journal: Special Topics, 227(15-16), pp. 2069-2083. (doi: 10.1140/epjst/e2018-800049-4)

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The categorization of quantum states for composite systems as either separable or entangled, or alternatively as Bell local or Bell non-local states based on local hidden variable theory is outlined, focusing on simple bipartite systems. The significance of states demonstrating Bell non-locality for settling the long standing controversy between the Copenhagen interpretation of the quantum measurement process involving “collapse of the wave-function” and the alternative interpretation based on pre-existing hidden variables is emphasized. Although experiments demonstrating violations of Bell locality in microscopic systems have now been carried out, there is current interest in finding Bell non-locality in quantum systems on a macroscopic scale, since this is a regime where a classical hidden variable theory might still apply. Progress towards finding macroscopic quantum states that violate Bell inequalities is reviewed. A new test for Bell non-locality that applies when the sub-system measured quantities are spin components with large outcomes is described, and applied to four mode systems of identical massive bosons in Bose-Einstein condensates.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Dalton, Professor Bryan
Authors: Dalton, B.J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:European Physical Journal: Special Topics
ISSN (Online):1951-6401
Published Online:13 February 2019
Copyright Holders:Copyright © 2019 The Author
First Published:First published in European Physical Journal: Special Topics 227(15-16): 2069-2083
Publisher Policy:Reproduced under a Creative Commons License

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