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.
The 3^{2}D_{5}/_{2} to 4^{2}S_{1}/_{2} g-factor ratio in ^{40}Ca^{+} is 0.5994888133(2) (Penning) and 0.599488813(6) (RF), a >40 imes uncertainty reduction that agrees across platforms.
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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.
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Dual-Platform Precision Measurement of the $3^2D_{5/2}$ to $4^2S_{1/2}$ $g$-Factor Ratio in $^{40}\text{Ca}^+$
The 3^{2}D_{5}/_{2} to 4^{2}S_{1}/_{2} g-factor ratio in ^{40}Ca^{+} is 0.5994888133(2) (Penning) and 0.599488813(6) (RF), a >40 imes uncertainty reduction that agrees across platforms.