# Entanglements of electrons and cavity-photons in the strong coupling regime

## TL;DR

This paper explores the theoretical framework for achieving and understanding strong coupling and entanglement between free electrons and cavity photons, proposing potential applications in quantum communication.

## Contribution

It introduces a unified model for strong electron-photon interactions and predicts non-Columbic entanglement between free electrons and photons, advancing quantum information science.

## Key findings

- Predicted non-Columbic electron-photon entanglement
- Unified model for strong-coupling electron-photon interactions
- Potential for electron-based quantum communication

## Abstract

This work sets a road-map towards an experimental realization of strong coupling between free-electrons and photons, and analytically explores entanglement phenomena that emerge in this regime. The proposed model unifies the strong-coupling predictions with known electron-photon interactions. Additionally, this work predicts a non-Columbic entanglement between freely propagating electrons. Since strong-coupling can map entanglements between photon pairs onto photon-electron pairs, it may harness electron beams for quantum communication, thus far exclusive to photons.