Classical entanglement: Oxymoron or resource?

TL;DR

This paper reviews and advances the concept of classical entanglement in optical beams, providing a unified theory and exploring its implications for understanding the classical-quantum boundary.

Contribution

It offers a comprehensive theoretical framework for classical entanglement in light beams and discusses potential extensions of this concept.

Findings

Unified theory for classical entanglement in optical beams

Identification of possible extensions of classical entanglement

Insights into the classical-quantum boundary

Abstract

In this work we review and further develop the controversial concept of "classical entanglement" in optical beams. We present a unified theory for different kinds of light beams exhibiting classical entanglement and we indicate several possible extensions of the concept. Our results shed new light upon the physics at the debated border between the classical and the quantum representations of the world.