Deciphering quantum enigmas: The role of nonlocal boxes in defining the boundaries of physical feasibility

Phys.org  February 14, 2024
Nonsignaling boxes (NS) are theoretical resources defined by the principle of no-faster-than-light communication. They generalize quantum correlations and some of them are known to collapse communication complexity (CC). However, this collapse is strongly believed to be unachievable in nature. An international team of researchers (France, Canada) provided intuition on which theories are unrealistic. They found a better sufficient condition for a nonlocal box to collapse CC, thus extended the known collapsing region. In some slices of NS, they showed that this condition coincides with an area outside of an ellipse… read more. TECHNICAL ARTICLE     Full text

Communication complexity game… Credit: Phys. Rev. Lett. 132, 070201, 14 February 2024