https://doi.org/10.1140/epjd/s10053-025-01086-8
Regular Article - Photons
Wigner negativity and nonlocal correlations
Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, Albert-Einstein-Allee 11, 89069, Ulm, Baden-Württemberg, Germany
a
michael.tschaffon@uni-ulm.de
Received:
4
June
2025
Accepted:
20
October
2025
Published online:
10
November
2025
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.
© The Author(s) 2025
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