Analysis shows Wigner functions are vital for CHSH inequality violations in quantum systems, indicating broader implications for nonlocality.
We investigate whether negative values of Wigner functions purely coming from correlations are sufficient for observing nonlocal correlations. We employ a simple model for superpositions of coherent states and examine how the corresponding Wigner negativity of correlations relates to the violation of a CHSH inequality based on pseudo-spins. We find that a critical amount of this negativity is necessary to violate the inequality, making a nonzero negativity not sufficient for observing nonlocal correlations.
No takes yet. Share an insight, caveat, or question.
Tschaffon et al. (2025) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: