Absolute frequency measurement of a $^{176}$Lu$^+\,(^{3}\mathrm{D}_1)$ standard against the NRC-FCs2 fountain with $2.6\times10^{-16}$ uncertainty

Title:Absolute frequency measurement of a $^{176}$Lu$^+\,(^{3}\mathrm{D}_1)$ standard against the NRC-FCs2 fountain with $2.6\times10^{-16}$ uncertainty

Abstract:We report an improved absolute frequency measurement of the $^{176}$Lu$^+\,(^{3}\mathrm{D}_1)$ optical frequency standard, evaluated via a remote link to the NRC-FCs2 caesium fountain primary frequency standard. Operating a single ion clock with 94.2% uptime over 10 days, and using an ambiguity-resolved precise point positioning (PPP-AR) link over the Global Positioning System, we determine an absolute frequency of $353\,638\,794\,073\,800.332(91)\,$Hz at a fractional uncertainty of $2.6 \times 10^{-16}$. This agrees with our previous result, which underpins the Comité international des poids et mesures recommended frequency value, and reduces the uncertainty by a factor of 3.6.

Atomic Physics (physics.atom-ph); Quantum Physics (quant-ph)

arXiv:2607.07044 [physics.atom-ph]

(or arXiv:2607.07044v2 [physics.atom-ph] for this version)

https://doi.org/10.48550/arXiv.2607.07044 Focus to learn more arXiv-issued DOI via DataCite

https://doi.org/10.1088/1681-7575/aea166 Focus to learn more DOI(s) linking to related resources

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