Entanglement swapping of atomic states through the photonic Faraday rotation

TL;DR

This paper presents a method for entanglement swapping of atomic states in cavity QED systems using photonic Faraday rotation, involving Bell-state measurements on atom-photon states.

Contribution

It introduces two schemes utilizing three and four cavities with circularly-polarized photons for entanglement swapping via Faraday rotation.

Findings

Successful entanglement swapping demonstrated in cavity QED systems.

Proposed schemes enable entanglement distribution between distant atoms.

Potential applications in quantum communication networks.

Abstract

We propose an entanglement swapping of atomic states confined by cavities QED using a photonic Faraday rotation. Two schemes are considered in which we use three and four cavities, respectively, plus an additional circularly-polarized photon. After interacting with an atom trapped inside the cavity the system evolves to an entangled atom-photon state. The entanglement swapping is then achieved by a Bell-state measurement upon the entire atom-photon state.