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.
(D5) The orthogonal state is given by ⏐ ⏐ ⏐φ (B) s, ⊥ ⟩ = B − ⟨B⟩φ s ∆ (B)φ s |φs⟩
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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.