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PreprintCC BY 4.0arXiv

Absolute frequency measurement of a 176Lu+ (3D1) standard against the NRC-FCs2 fountain with 2.6×10−16 uncertainty

  • K. J. Arnold
  • Bin Jian
  • Zhao Zhang
  • Qi Zhao
  • Qin Qichen
  • N. Jayjong
  • M. D. K. Lee
  • Scott Beattie
  • M. D. Barrett
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Abstract

We report an improved absolute frequency measurement of the 176Lu+ (3D1) 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 × 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.

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Cite

BibTeXRIS
BibTeX
@misc{arnold2026absolute,
  title = {{Absolute frequency measurement of a $^176$Lu$^+\,(^3\mathrmD_1)$ standard against the NRC-FCs2 fountain with $2.6\times10^-16$ uncertainty}},
  author = {K. J. Arnold and Bin Jian and Zhao Zhang and Qi Zhao and Qin Qichen and N. Jayjong and M. D. K. Lee and Scott Beattie and M. D. Barrett},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2607.07044},
  eprint = {2607.07044},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.07044},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Absolute frequency measurement of a ^176Lu^+ (^3D_1) standard against the NRC-FCs2 fountain with 2.6×10^−16 uncertainty
AU  - K. J. Arnold
AU  - Bin Jian
AU  - Zhao Zhang
AU  - Qi Zhao
AU  - Qin Qichen
AU  - N. Jayjong
AU  - M. D. K. Lee
AU  - Scott Beattie
AU  - M. D. Barrett
PY  - 2026
DA  - 2026/09/28
PB  - arXiv
DO  - 10.48550/arxiv.2607.07044
UR  - https://arxiv.org/abs/2607.07044
AB  - We report an improved absolute frequency measurement of the ^176Lu^+ (^3D_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 × 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.
ER  -