Experimental Bell inequality violation without the postselection loophole

TL;DR

This paper reports the first experimental violation of the Bell-CHSH inequality with energy-time entangled photons that is free from the postselection loophole, advancing the robustness of quantum nonlocality tests.

Contribution

It demonstrates a Bell inequality violation using energy-time entangled photons without the postselection loophole, improving the reliability of quantum nonlocality experiments.

Findings

First violation of Bell-CHSH with energy-time entangled photons free of postselection loophole

Experimental evidence supporting quantum nonlocality without certain loopholes

Advancement in loophole-free Bell test techniques

Abstract

We report on an experimental violation of the Bell-Clauser-Horne-Shimony-Holt (Bell-CHSH) inequality using energy-time entangled photons. The experiment is not free of the locality and detection loopholes, but is the first violation of the Bell-CHSH inequality using energy-time entangled photons which is free of the postselection loophole described by Aerts et al. [Phys. Rev. Lett. 83, 2872 (1999)].