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We report on the demonstration of ion-photon entanglement and Bell inequalityviolation in a system of trapped 138Ba+ ions. Entanglement between the Zeemansublevels of the ground state of a single 138Ba+ ion and the polarization stateof a single 493 nm photon emitted by the ion with a fidelity of $0.84\pm0.01$was achieved, along with a Bell signal of 2.3, exceeding the classical limit of2 by over eight standard deviations. This system is a promising candidate for aloophole-free Bell inequality violation test as the wavelengths of thetransitions of 138Ba+ are in the visible region and thus suitable for longrange transmission over fiber optic cable.

Ion-Photon Entanglement and Bell Inequality Violation with 138Ba+