Bell's inequalities and non-locality - I. Jauslin

This is a talk that was given in the Rutgers Graduate/Undergraduate Online Seminar in Mathematical Physics (GUOSIMP). We host talks every other week on Thursdays from 12:10pm to 1:10pm EST.

Speaker: Ian Jauslin



Accessibility of Talk: Beginner

Date: Feb 16th, 2023

Title: Bell's inequalities and non-locality

Abstract: John Stuart Bell proved that quantum mechanics is non-local, which means that an action can, in principle, have an effect instantaneously and arbitrarily far away. This fact has since been demonstrated experimentally by the 2022 physics Nobel laureates and their collaborators. In this talk, I will give two simple proofs of Bell's theorem, and discuss the physical implications of this result.

[dimitrispapadimitriou]

41:00 Not exactly : there's a big difference between being non- local in the weak sense ( unmodified QM) and being non-local in the strong sense, i.e. that violates Lorentz Invariance so that you need "absolute simultaneity" ( as in non local hidden variables - Bohmian mechanics) like in the old obsolete "aether" days of Larmor et al...
So it's not correct that all that Bell "says" is that QM is "non local".
1) Bohmian mechanics is not a version of QM, it is technically a different theory.
2) You have to define separately what you mean by "non-locality", because it's not the same in each of the two alternatives...