First 229Th nuclear clock synchronized: solid-state route points to tiny, ultra-stable timekeeping
jwt0625 · x · 2026-10-14
A team in China has synchronized a nuclear clock to 229Th, published in Nature. Nuclear clocks promise better stability than atomic clocks: the nuclear transition has 10x higher Q and is shielded from environmental perturbations inside the nucleus. Th-229 is unique in having a laser-excitable nuclear transition (148 nm), long thought impossible for timekeeping.
The key implication of low environmental sensitivity: it can work in SOLID STATE — no fragile optical lattices or vapor cells, just Th-229 doped into a host crystal like CaF₂, potentially tiny. Next steps per JILA/TU Wien linewidth-vs-doping data: echo/rephase the inhomogeneous broadening, make higher-power 148 nm pulses, and build better detectors. Still below atomic-clock SOTA, but Th-229 could become the new standard soon.
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