Deterministic generation of polarization-entangled photon pairs in a cavity-QED system

TL;DR

This paper presents a cavity-QED scheme for the deterministic generation of polarization-entangled photon pairs using a four-level atom and adiabatic passage, promising robustness for quantum information applications.

Contribution

It introduces a novel cavity-QED approach employing a four-level tripod atom and stimulated Raman adiabatic passage to produce entangled photon pairs deterministically.

Findings

Robust against atomic spontaneous decay.

Successfully generates polarization-entangled photon pairs.

Potential for applications in quantum information processing.

Abstract

We propose a cavity-QED scheme that can deterministically generate Einstein-Podosky-Rosen polarization-entangled photon pairs. A four-level tripod atom successively couples to two high-Q optical cavities possessing polarization degeneracy, assisted by a classical $\pi$-polarized pump field. The stimulated Raman adiabatic passage process in the atom-cavity system is used to produce the polarization-entangled photon pairs. The proposal is particularly robust against atomic spontaneous decay, which should have potential applications in quantum information processing.