Bell-test significance for quantitative assessment of space-distributed entanglement for quantum information networks and entanglement-based QKD

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This framework proposes a quantitative statistical method, based on Bell inequality violations in sigma units, to assess the quality of space-distributed entanglement. By explicitly accounting for high-loss communication regimes, the method determines if the generated resource is sufficient for quantum key distribution or quantum network applications. This provides a rigorous metric for certifying the functional utility of entanglement in real-world satellite links.