Quantum analogues of Hardy's nonlocality paradox
Tobias Fritz
TL;DR
This paper introduces new Hardy-type nonlocality variants that demonstrate superquantum correlations surpass quantum correlations, highlighting fundamental differences in nonlocality strength.
Contribution
It presents Hardy-like nonlocality variants realized by PR-boxes but not by quantum correlations, illustrating superquantum nonlocality without inequalities.
Findings
Hardy variants realized by PR-boxes
Superquantum correlations are qualitatively stronger
Nonlocality proof without inequalities
Abstract
Hardy's nonlocality is a "nonlocality proof without inequalities": it exemplifies that quantum correlations can be qualitatively stronger than classical correlations. This paper introduces variants of Hardy's nonlocality in the CHSH scenario which are realized by the PR-box, but not by quantum correlations. Hence this new kind of Hardy-type nonlocality is a proof without inequalities showing that superquantum correlations can be qualitatively stronger than quantum correlations.
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