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

Abstract

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 $0.84\pm 0.01$ 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.

5 pages, 3 figures, 1 table

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• Fast photon-mediated entanglement of continuously-cooled trapped ions for quantum networking
• C-band single photons from a trapped ion via two-stage frequency conversion
• Ion-photon entanglement and quantum frequency conversion with trapped Ba${}^{+}$ ions
• Entanglement between a trapped ion qubit and a 780-nm photon via quantum frequency conversion
• Raman sideband cooling of a 138Ba+ ion using a Zeeman interval
• Fast mixed-species quantum logic gates for trapped-ion quantum networks
• Frequency stabilization of a 650 nm laser to I${}_2$ spectrum for trapped ${}^{138}$Ba${}^{+}$ ions