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QI: Fachverband Quanteninformation
QI 12: Quantum Foundations
QI 12.7: Vortrag
Mittwoch, 11. März 2026, 17:00–17:15, BEY/0137
Beyond Mermin: Multipartite Bell Inequalities with Many Measurement Settings — •Fynn Otto1, Junxiang Huang2, Carlos de Gois1,3,4, Xiao Yuan2, and Otfried Gühne1 — 1Universität Siegen, Siegen, Germany — 2Peking University, Beijing, China — 3Inria de Saclay, Palaiseau, France — 4École polytechnique, Palaiseau, France
Nonlocal correlations in multipartite quantum systems are typically probed through Bell inequalities with only a few measurement settings, limiting the sensitivity of existing tests. Here we introduce a generalization of the Mermin inequality to an arbitrarily large number of measurement settings per party. This family of inequalities is maximally violated by Greenberger-Horne-Zeilinger states and substantially lowers the noise thresholds required to certify nonlocality and nonlocality depth. We further derive Bell inequalities capable of detecting genuine multipartite entanglement in broad classes of graph states. Finally, we discuss prospects for experimental implementations of these inequalities in state-of-the-art quantum platforms. Together, these advances expand the toolbox for probing the structure of quantum correlations and strengthen practical routes toward certifying entanglement in complex quantum systems.
Keywords: Bell inequalities; Multipartite nonlocality; Multipartite entanglement