A functional thorium-229 optical nuclear clock is demonstrated in a solid-state crystal with shot-noise limited performance and applied to dark matter constraints.
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In strong-coupling regime, sideband cooling of planar ion crystals (up to 91 ions) yields residual phonon occupation scaling as 1/N² after one pulse, reaching <2×10^{-4} with iterations; dynamics become independent of initial phonon statistics for large N.
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A thorium-229 optical nuclear clock with feedback loop
A functional thorium-229 optical nuclear clock is demonstrated in a solid-state crystal with shot-noise limited performance and applied to dark matter constraints.
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Collective enhancement in sideband cooling of ion crystals
In strong-coupling regime, sideband cooling of planar ion crystals (up to 91 ions) yields residual phonon occupation scaling as 1/N² after one pulse, reaching <2×10^{-4} with iterations; dynamics become independent of initial phonon statistics for large N.