Large scale EPR correlations and cosmic gravitational waves

TL;DR

This paper investigates how quantum EPR correlations in photon pairs are affected by the cosmic gravitational wave background, showing they can survive at cosmic scales despite potential decoherence.

Contribution

It provides an analysis of the impact of the cosmic gravitational wave background on EPR correlations and demonstrates their robustness over large cosmic distances.

Findings

EPR correlations are minimally affected by the cosmic gravitational wave background.

Quantum decoherence due to gravitational waves remains small at large scales.

EPR correlations can potentially be observed across cosmic distances.

Abstract

We study how quantum correlations survive at large scales in spite of their exposition to stochastic backgrounds of gravitational waves. We consider Einstein-Podolski-Rosen (EPR) correlations built up on the polarizations of photon pairs and evaluate how they are affected by the cosmic gravitational wave background (CGWB). We evaluate the quantum decoherence of the EPR correlations in terms of a reduction of the violation of the Bell inequality as written by Clauser, Horne, Shimony and Holt (CHSH). We show that this decoherence remains small and that EPR correlations can in principle survive up to the largest cosmic scales.