Possibility of Entanglement at LIGO!

TL;DR

This paper demonstrates that classical gravitational waves can produce entanglement with test masses, leading to violations of Bell inequalities, challenging the classical-quantum boundary in gravity.

Contribution

It shows that classical linearized gravity waves can generate entanglement and violate Bell inequalities, suggesting potential quantum features in classical gravity.

Findings

Classical gravity waves can entangle with test masses.

Entangled states violate Bell-CHSH inequality.

Challenges the classical-quantum distinction in gravity.

Abstract

It is shown that a linearized classical gravity wave $\hat{a}$ {\em la} Einstein can get entangled with an array of test masses in a plane perpendicular to its direction of propagation. A Bell-CHSH inequality based on the requirement of noncontextuality for classical realism is derived, and it is shown that the entangled state produced violates this inequality.