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.
Weak Values and Quantum Nonlocality
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abstract
Entanglement and nonlocality are studied in the framework of pre-/post-selected ensembles with the aid of weak measurements and the Two-State-Vector Formalism. In addition to the EPR-Bohm experiment, we revisit the Hardy and Cheshire Cat experiments, whose pre- or post-selected states give rise to curious phenomena. We then turn to even more peculiar phenomenon suggesting "emerging correlations" between independent pre- and post-selected ensembles of particles. This can be viewed as a quantum violation of the classical "pigeonhole principle".
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quant-ph 1years
2026 1verdicts
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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.