SAMOP 2023 – scientific programme

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QI: Fachverband Quanteninformation

QI 25: Quantum Entanglement II

QI 25.7: Talk

Thursday, March 9, 2023, 12:30–12:45, B302

Average Correlation as an Indicator for Nonclassicality — •Michael Erich Nicolas Tschaffon, Johannes Seiler, and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany

Since their introduction, Bell inequalities have been used to verify nonclassicality of bipartite qubit states. While being a popular tool to test and even quantify nonclassicality, Bell inequalities suffer from being complicated to construct experimentally and cumbersome to evaluate and analyse theoretically. We suggest a solution to this trade-off between accurate predictions and simplicity. For this purpose, we introduce another quantity as a new indicator for nonclassicality: average correlation. It has both advantages of indicating whether a state is nonclassical, while still being simple to calculate and measure. We show that based on average correlation we obtain new inequalities that can be used to test nonclassicality. Moreover, we discuss how average correlation can even be used to classify all bipartite qubit states.