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.
(30) The overlap between the states is given by c = |⟨φ|ψ ⟩|= |⟨φ 1|ψ 1⟩ ⟨φ 2|ψ 2⟩|=r1r2, (31) where we denote |⟨φj|ψj⟩|=rj and demand that r1r2 = 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.