Deterministic spin-photon entanglement from a trapped ion in a fiber Fabry-Perot cavity

The development of efficient network nodes is a key element for the realisation of quantum networks which promise great capabilities as distributed quantum computing or provable secure communication. We report the realisation of a quantum network node using a trapped ion inside a fiber-based Fabry-Perot cavity. We show the generation of deterministic entanglement at a high fidelity of $91.2(2)$\,\% between a trapped Yb--ion and a photon emitted into the resonator mode. We achieve a success probability for generation and detection of entanglement for a single shot of $2.5 \cdot 10^{-3}$ resulting in 62\,Hz entanglement rate.

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