Test of the no-signaling principle in the Hensen "loophole-free CHSH experiment"

TL;DR

This paper reanalyzes the Hensen loophole-free CHSH experiment data, revealing a significant violation of the no-signaling principle when the sample size is increased, challenging the original interpretation of the experiment.

Contribution

It uncovers a loophole in the original experiment and demonstrates that the no-signaling principle may be violated under certain data analysis conditions.

Findings

Violation of no-signaling principle with larger sample size

Original experiment's data analysis may overlook this loophole

Potential implications for quantum nonlocality tests

Abstract

We analyze the data from the loophole-free CHSH experiment performed by Hensen et al., and show that it is actually not exempt of an important loophole. By increasing the size of the sample of event-ready detections, one can exhibit in the experimental data a violation of the no-signaling principle with a statistical significance at least similar to that of the reported violation of the CHSH inequality, if not stronger.