Spooky Action at a Distance

TL;DR

This paper explores quantum entanglement, demonstrating its implications for non-local action, providing a criterion to identify entangled states, and introducing a measure to quantify entanglement in pure states.

Contribution

It offers a straightforward criterion for detecting entanglement and proposes a measure to quantify the degree of entanglement in pure quantum states.

Findings

Entanglement implies action at a distance.

A simple criterion for pure state entanglement.

A measure for quantifying entanglement.

Abstract

This article studies quantum mechanical entanglement. We begin by illustrating why entanglement implies action at a distance. We then introduce a simple criterion for determining when a pure quantum state is entangled. Finally, we present a measure for the amount of entanglement for a pure state.