Quantitative comparison of quantum pseudo-telepathy games and Bell inequalities

Abstract

Quantum pseudo-telepathy games, such as the Mermin-Peres magic square and the doily game, theoretically allow players to win with unit probability when using entangled quantum strategies. We quantitatively characterize the quantum advantage in these games and compare it with violations of two Bell inequalities: the Clauser-Horne-Shimony-Holt and the Collins-Gisin inequalities. The analysis is restricted to two families of two-qubit states: modified Werner states and Bell-diagonal states. For each case, we identify and quantify the regions of quantum state space that exhibit either a quantum advantage or a Bell inequality violation, relative to the set of all entangled states. Within these families, the doily game captures a larger fraction of entangled states than the Mermin-Peres magic square game, though both are significantly more limited than the regions associated with Bell inequality violations. Although both approaches are fundamentally linked to quantum contextuality, our analysis of the examined two-qubit state families indicates that Bell inequalities are more effective at revealing entanglement, even if pseudo-telepathy games offer a more intuitive and conceptually appealing perspective.

12 pages, 5 figures

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