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Suppose a two point covariance : ##C(a,b)=\langle A\otimes B\rangle## with the eigenvalues of A and B in {-1,1}.
Does there exist a mixed state such that ##CHSH=C(a,b)-C(a,b')+C(a',b)+C(a',b')>2\sqrt{2}## ?
Does there exist a mixed state such that ##CHSH=C(a,b)-C(a,b')+C(a',b)+C(a',b')>2\sqrt{2}## ?