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Extending the Known Region of Nonlocal Boxes that Collapse Communication Complexity
Pierre Botteron1, Anne Broadbent2, Marc-Olivier Proulx2
1Institut de Mathématiques de Toulouse, Université de Toulouse (Paul Sabatier), France.
Abstract:
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, so its study provides intuition on which theories are unrealistic. In the present Letter, we find a better sufficient condition for a nonlocal box to collapse CC, thus extending the known collapsing region. In some slices of NS, we show this condition coincides with an area outside of an ellipse.
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