We report on the demonstration of ion-photon entanglement and Bell inequality violation in a system of trapped 138Ba+ ions. Entanglement between the Zeeman sublevels of the ground state of a single 138Ba+ ion and the polarization state of a single 493 nm photon emitted by the ion with a fidelity of 0.84±0.01 was achieved, along with a Bell signal of 2.3, exceeding the classical limit of 2 by over eight standard deviations. This system is a promising candidate for a loophole-free Bell inequality violation test as the wavelengths of the transitions of 138Ba+ are in the visible region and thus suitable for long range transmission over fiber optic cable.
@article{arxiv.1310.0028,
title = {Ion-Photon Entanglement and Bell Inequality Violation with 138Ba+},
author = {Carolyn Auchter and Chen-Kuan Chou and Thomas W. Noel and Boris B. Blinov},
journal= {arXiv preprint arXiv:1310.0028},
year = {2015}
}