Loopholes in Bell inequality tests of local realism
2014 (English)In: Journal of Physics A: Mathematical and Theoretical, ISSN 1751-8113, E-ISSN 1751-8121, Vol. 47, no 42, 424003- p.Article, review/survey (Refereed) Published
Bell inequalities are intended to show that local realist theories cannot describe the world. A local realist theory is one where physical properties are defined prior to and independent of measurement, and no physical influence can propagate faster than the speed of light. Quantum-mechanical predictions for certain experiments violate the Bell inequality while a local realist theory cannot, and this shows that a local realist theory cannot give those quantum-mechanical predictions. However, because of unexpected circumstances or loopholes in available experiment tests, local realist theories can reproduce the data from these experiments. This paper reviews such loopholes, what effect they have on Bell inequality tests, and how to avoid them in experiment. Avoiding all these simultaneously in one experiment, usually called a loophole-free or definitive Bell test, remains an open task, but is very important for technological tasks such as device-independent security of quantum cryptography, and ultimately for our understanding of the world.
Place, publisher, year, edition, pages
IOP Publishing: Hybrid Open Access , 2014. Vol. 47, no 42, 424003- p.
non-locality; efficiency bounds; element of reality; finite sample; coincidence loophole; quantum non-locality
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-112644DOI: 10.1088/1751-8113/47/42/424003ISI: 000344222200004OAI: oai:DiVA.org:liu-112644DiVA: diva2:769078