The group of Michael Köhl succeeded in implementing a special interface between light and matter. In npj Quantum Information they report the realization of a quantum network node using a trapped ion inside a fiber-based Fabry–Perot cavity. They 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.
The results of the study may be relevant for distributed quantum computing or provably secure communication. In future studies, the researchers plan to further develop their system by, for example, improving the stability of the light-matter interface and using the setup for the distribution of quantum keys.
Publication: Pascal Kobel, Moritz Breyer & Michael Köhl: Deterministic spin-photon entanglement from a trapped ion in a fiber Fabry–Perot cavity. npj Quantum Information; DOI: 10.1038/s41534-020-00338-2
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