A rare-earth ion in a long-lived clock state can control a nearby ensemble of nuclear spins. Interfacing this pristine photon emitter with a small quantum processor may be a route towards making identical solid-state nodes for quantum networks.
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Le Gall, C. Clock qubit conducts nuclear ensemble. Nat. Phys. 18, 230–231 (2022). https://doi.org/10.1038/s41567-022-01533-y