Tackling Loopholes in Experimental Tests of Bell's Inequality

TL;DR

This paper reviews recent experimental efforts to close major loopholes in tests of Bell's inequality, strengthening the evidence for quantum entanglement and nonlocality.

Contribution

It provides a comprehensive overview of how recent experiments have addressed the key loopholes in Bell test experiments, advancing the validation of quantum mechanics.

Findings

Loopholes in Bell tests have been effectively closed in recent experiments.

Experimental results strongly support quantum entanglement and nonlocality.

The review highlights progress in experimental design to eliminate alternative explanations.

Abstract

Bell's inequality sets a strict threshold for how strongly correlated the outcomes of measurements on two or more particles can be, if the outcomes of each measurement are independent of actions undertaken at arbitrarily distant locations. Quantum mechanics, on the other hand, predicts that measurements on particles in entangled states can be more strongly correlated than Bell's inequality would allow. Whereas experimental tests conducted over the past half-century have consistently measured violations of Bell's inequality---consistent with the predictions of quantum mechanics---the experiments have been subject to one or more "loopholes," by means of which certain alternatives to quantum theory could remain consistent with the experimental results. This chapter reviews three of the most significant loopholes, often dubbed the "locality," "fair-sampling," and "freedom-of-choice" loopholes, and describes how recent experiments have addressed them.