A question for people who know about Bell inequalities: in the 1982 Aspect paper they present them in this form (a version of the CHSH inequality), with an experimental value (& violation) of S = 0.101pic.twitter.com/MR1CcBfO2q
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It can't be detector inefficiencies because they make the fair sampling assumption. My guess is dark counts plus events where they only detect one of the two particles.
I'm not an expert, but I was able to find this page discussing the paper which says (is Sec. 7.1.3) that while the theoretical maximum is ~2.8, correcting for "instrumental deficiencies" the maximum is 2.448. I can't see where they've got that number from. https://www.ugr.es/~bosca/WebFCenRed/indexFundFC_archivos/Historia7-1.htm …
Well, I guess the number agrees with the 0.112 maximum of S given in the paper, but I can't see any reference to it being a correction for instrumental deficiencies
Giving cuckoo’s egg vibes.
My recollection is that due to detector inefficiencies and source imperfections these experiments were indeed quite far from the maximal violation
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