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 realization of quantum networks which promise great capabilities as distributed quantum computing or provable secure communication. We report the realization 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 90.1(17)% 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 × 10⁻³ resulting in 62 Hz entanglement rate.

Pascal Kobel, Moritz Breyer, Michael Köhl