Two-outcome synchronous correlation sets and Connes' embedding problem
We show that Connes' embedding problem is equivalent to the weak Tsirelson problem in the setting of two-outcome synchronous correlation sets. We further show that the extreme points of two-outcome synchronous correlation sets can be realized using a certain class of universal C*-algebras. We examine these algebras in the three-experiment case and verify that the strong and weak Tsirelson problems have affirmative answers in that setting.
Russell, Travis B. Two-outcome synchronous correlation sets and Connes' embedding problem. Operator Algebras. 2019.