Single rare-earth ions are hard to observe and even harder to use as qubits. However, with the help of coupling to an optical cavity and clever engineering of selection rules, a big step has been taken to establish their new role in the quantum world.
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Kolesov, R., Wrachtrup, J. A rare quantum leap. Nat. Phys. 16, 503–504 (2020). https://doi.org/10.1038/s41567-020-0871-3
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DOI: https://doi.org/10.1038/s41567-020-0871-3
