Bell tests with photon-entanglement: LHV models and critical efficiencies at the light of Wigner-PDC optics

TL;DR

This paper discusses how the Wigner-PDC model of photon entanglement challenges traditional interpretations of Bell tests, suggesting a field-theoretical approach that accounts for detection errors without excluding local realism.

Contribution

It proposes abandoning the particle-based view of PDC-generated light in favor of a quantum field-theoretical description aligned with the Wigner-PDC model.

Findings

Detection errors are not independent and cannot be mitigated by better detectors.

Experimental evidence can be explained without rejecting local realism.

A field-theoretical description aligns with the Wigner-PDC approach.

Abstract

Within the Wigner-PDC picture of photon entanglement, detection "errors" are not independent (though they may look, on average), nor can they be controlled by means of a technological improvement on the detectors. Those two elements make possible the interpretation of experimental evidence without the need to exclude local realism: for that reason, we propose the abandonment of the usual (photon, particle-based) description of (PDC-generated) light states, in favour of an also quantum, but field-theoretical description (QED), a description that finds a one-to-one equivalent in the Wigner-PDC approach we have advocated in recent posts.