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This is a Quantitative Study study.

October 3, 2025Open Access

Unbounded-input explicit Bell inequalities for general quantum networks

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This work constructs nonlinear Bell inequalities, quantifying nonlocality in quantum networks with independent sources.

Nonlocality is quantified using explicit nonlinear Bell inequalities tailored for quantum networks with multiple inputs.
The derived inequalities allow for the analytical calculation of optimal quantum violations based on network characteristics.
Two-qubit mixed states are investigated under separable measurements to evaluate the maximum violations achievable in the network.
Device-independent methods enable distinguishing between different quantum network topologies based on leaf node counts.

Xiao et al. (2025) studied this question.

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