Ghostly action at a distance: a non-technical explanation of the Bell inequality

TL;DR

This paper provides a simple non-technical explanation of Bell's inequality and discusses how EPR experiment results challenge the principle of strong locality, implying possible faster-than-light influences in nature.

Contribution

It offers an accessible explanation of Bell's inequality and explores its implications for locality, causality, and relativity, clarifying complex quantum concepts for a broader audience.

Findings

EPR experiments violate strong locality principles

Bell's inequality demonstrates non-local correlations in quantum mechanics

Results suggest possible faster-than-light influences in nature

Abstract

We give a simple non-mathematical explanation of Bell's inequality. Using the inequality, we show how the results of Einstein-Podolsky-Rosen (EPR) experiments violate the principle of strong locality, also known as local causality. This indicates, given some reasonable-sounding assumptions, that some sort of faster-than-light influence is present in nature. We discuss the implications, emphasizing the relationship between EPR and the Principle of Relativity, the distinction between causal influences and signals, and the tension between EPR and determinism.