We demonstrate an efficient experimental scheme for producing polarization-entangled photon pairs from spontaneous four-wave mixing (SFWM) in a laser-cooled 85Rb atomic ensemble, with a bandwidth (as low as 0.8 MHz) much narrower than the rubidium atomic natural linewidth. By stabilizing the relative phase between the two SFWM paths in a Mach-Zehnder interferometer configuration, we are able to produce all four Bell states. These subnatural-linewidth photon pairs with polarization entanglement are ideal quantum information carriers for connecting remote atomic quantum nodes via efficient light-matter interaction in a photon-atom quantum network.
@article{arxiv.1402.2530,
title = {Subnatural-Linewidth Polarization-Entangled Photon Pairs with Controllable Temporal Length},
author = {Kaiyu Liao and Hui Yan and Junyu He and Shengwang Du and Zhi-Ming Zhang and Shi-Liang Zhu},
journal= {arXiv preprint arXiv:1402.2530},
year = {2015}
}
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Title changed, published version, 5 pages + 3 pages Supplemental Material