Perspective Chapter: Why Do We Care about Violating Bell Inequalities?

Abstract

High energy experiments present an exciting new regime in which to explore the violation of Bell inequalities by nature. There are two main reasons why one is interested in Bell inequality violation. The first is that—for suitable experimental configurations—Bell inequality violation can indicate the failure of the condition of Local Causality, which condition is a natural way of capturing the desideratum of no superluminal action-at-a-distance. The second is that Bell inequality violation is an Entanglement Witness. I review both of these reasons for interest, and suggest that high energy experiments plausibly involve the latter rather more than the former, at least as currently configured.