Fig. 3: Region of allowed correlations for symmetric distributions with E1 = 0; represented in the plane E2 vs E3. | Nature Communications

Fig. 3: Region of allowed correlations for symmetric distributions with E1 = 0; represented in the plane E2 vs E3.

From: Constraints on nonlocality in networks from no-signaling and independence

Fig. 3

The turquoise region is ruled out by NSI constraints (dashed turquoise line given by Eq. (15)), while the gray region is excluded from simple positivity constraints. The white region is accessible via trilocal models. Correlations in the yellow region satisfy NSI constraints (from the hexagon inflation), but we could not find a trilocal model for them. Explicit trilocal models are also obtained for the correlations marked by blue dots (see Supplementary Note 2).

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