Local hidden-variable model for a recent experimental test of quantum nonlocality and local contextuality

TL;DR

This paper presents a local hidden-variable model that can explain recent experimental results on quantum nonlocality and contextuality, highlighting potential loopholes due to detection inefficiencies.

Contribution

It introduces a local hidden-variable model that mimics experimental outcomes, emphasizing the role of post-selection in observed contextuality.

Findings

The model reproduces experimental results under certain conditions.

Post-selection induces apparent contextuality in the model.

Highlights potential loopholes in quantum nonlocality tests.

Abstract

An experiment has recently been performed to demonstrate quantum nonlocality by establishing contextuality in one of a pair of photons encoding four qubits; however, low detection efficiencies and use of the fair-sampling hypothesis leave these results open to possible criticism due to the detection loophole. In this Letter, a physically motivated local hidden-variable model is considered as a possible mechanism for explaining the experimentally observed results. The model, though not intrinsically contextual, acquires this quality upon post-selection of coincident detections.