Re: Why the upper bound on CHSH is 2\/2 and not 4 ?
Posted: Sat Sep 19, 2015 7:07 pm
Gordon Watson wrote:When I first saw the heading for this thread I was going to suggest (as I now do) that it be changed to: Why the EXPERIMENTAL upper bound on CHSH is 2√2 and not 4?
Although I see where you are coming from, and although I agree with Michel's classification above, I disagree with your suggestion. The title is fine just as it is. By CHSH I simply mean the string of four expectation values. I have a theoretical model that analytically gives the bound of on the string of four expectation values. See, for example, Eq. (5) of this paper. This theoretical bound is more generally referred to as Tsirel’son's bound, and that is what I have in mind in the title of this thread. In short, as Fred also indicates, is not just an experimental bound. It is also a theoretical bound (more precisely, it is a physical bound).