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.
(33) Following an optimization procedure (see Appendix C), we obtain the separable bound ∥B∥TS, c,s = 2 [cos(θ) + sin(θ)(1 − c)] =λ + − Λ −c
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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.