Post-selection enhances CHSH correlations in PPS ensembles but entanglement is required to exceed separable PPS bounds, enabling constructive post-selected entanglement witnesses for pure two-qubit states.
We start by rewriting the Bell operator in the following way B = (Λ + + Λ − )σ1 ⊗ σ1 +σ2 ⊗ σ2 2 + (Λ + − Λ − )σ1 ⊗ σ1 − σ2 ⊗ σ2 2
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Quantum nonlocal correlations of anomalous weak values
Post-selection enhances CHSH correlations in PPS ensembles but entanglement is required to exceed separable PPS bounds, enabling constructive post-selected entanglement witnesses for pure two-qubit states.