The paper presents a method for fast photon-mediated entanglement of co-trapped atomic barium ions for quantum networking. The authors achieve an entanglement fidelity of at least 94% by collecting and interfering single visible photons from each ion through high numerical aperture objectives and detecting them in coincidence. They introduce ytterbium ions for sympathetic cooling, which allows for continuous entanglement at a rate of 250 s\(^{-1}\). The experiment uses two 0.8 NA objectives to collect ion fluorescence, with each lens aligned to a different ion, and the ions are trapped in a four-rod rf Paul trap. The entanglement process involves optical pumping, pulsed excitation, and state analysis, with a success probability of \(2.4(1) \times 10^{-4}\). The authors also measure the populations and coherences of the entangled ions, achieving a fidelity lower bound of \(F \geq 93.7(1.3)\%\). The continuous entanglement rate is significantly improved by the introduction of ytterbium ions, which allows for uninterrupted attempts and higher success rates. This work paves the way for scalable quantum computing and networking, enabling universal control over a larger Hilbert space and enhancing the collective power of quantum processors.The paper presents a method for fast photon-mediated entanglement of co-trapped atomic barium ions for quantum networking. The authors achieve an entanglement fidelity of at least 94% by collecting and interfering single visible photons from each ion through high numerical aperture objectives and detecting them in coincidence. They introduce ytterbium ions for sympathetic cooling, which allows for continuous entanglement at a rate of 250 s\(^{-1}\). The experiment uses two 0.8 NA objectives to collect ion fluorescence, with each lens aligned to a different ion, and the ions are trapped in a four-rod rf Paul trap. The entanglement process involves optical pumping, pulsed excitation, and state analysis, with a success probability of \(2.4(1) \times 10^{-4}\). The authors also measure the populations and coherences of the entangled ions, achieving a fidelity lower bound of \(F \geq 93.7(1.3)\%\). The continuous entanglement rate is significantly improved by the introduction of ytterbium ions, which allows for uninterrupted attempts and higher success rates. This work paves the way for scalable quantum computing and networking, enabling universal control over a larger Hilbert space and enhancing the collective power of quantum processors.