Generation of entangled photon pairs in optical cavity-QED: Operating in the bad cavity limit

TL;DR

This paper proposes a cavity-QED scheme for generating polarization-entangled photon pairs with high fidelity in the bad cavity limit, using an adiabatic passage with a four-level atom and cavity modes, validated by simulations.

Contribution

It introduces a novel cavity-QED method for entangled photon pair generation that remains effective in the bad cavity regime, enhancing practical quantum communication.

Findings

Fidelities close to one predicted in the bad cavity limit

High entanglement capability demonstrated through simulations

Robustness against decoherence in realistic parameters

Abstract

We propose an optical cavity-QED scheme for the deterministic generation of polarization entangled photon pairs that operates with high fidelity even in the bad cavity limit. The scheme is based on the interaction of an excited four-level atom with two empty optical cavity modes via an adiabatic passage process. Monte-Carlo wave function simulations are used to evaluate the fidelity of the cavity-QED source and its entanglement capability in the presence of decoherence. In the bad cavity limit, fidelities close to one are predicted for state-of-the-art experimental parameter values.