Photon-graviton polarization entanglement induced by a classical electromagnetic wave

TL;DR

This paper investigates how a classical electromagnetic wave can induce photon-graviton entanglement, potentially leading to observable Bell states, by analyzing quantum state evolution in a Minkowskian spacetime.

Contribution

It introduces a model combining classical EM waves and quantized gravitons to demonstrate photon-graviton entanglement generation and discusses potential observation scenarios.

Findings

Propagation of EM wave can generate Bell states in photon-graviton polarization basis

Photon-graviton entanglement can be induced by classical electromagnetic waves

Potential for observing entangled photons in artificial and natural environments

Abstract

We study the photon-graviton pair production induced by the propagation of a classical electromagnetic (EM) wave in a Minkowskian spacetime. In our model, the gravitational field is described in terms of the quantized graviton field, whereas the electromagnetic field is split into a classical drive (a linearly or circularly polarized electromagnetic wave) and a quantum fluctuation field. We analyze the time evolution of the quantum state showing that, among other outcomes, the propagation of the EM wave can generate Bell states in the photon-graviton polarization basis. We finally discuss the possibility to observe entangled photons in artificial and natural scenarios.