  It is known that there exist non-local correlations that respect no-signaling
criterion, but violate Bell-type inequalities more than quantum-mechanical
correlations. Such super quantum correlations were introduced as the
Popescu-Rohrlich (PR) box. We consider such non-local boxes with two/three
inputs and two/three outputs. We show that these super quantum correlations can
lead to signaling when at least one of the input bit has access to a word line
along a closed time-like curve.
