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 π-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.
@article{arxiv.0711.1651,
title = {Deterministic generation of polarization-entangled photon pairs in a cavity-QED system},
author = {Pengbo li and Ying Gu and Qihuang Gong and Guangcan Guo},
journal= {arXiv preprint arXiv:0711.1651},
year = {2009}
}