SI-traceable measurement of an optical frequency at the low 10^−16 level without a local primary standard
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agrees with other measurements based on local state-of-the-art cesium fountains.
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The four frequency ratios in Eq. 5 were not measured simultaneously and need to be extrapolated to common intervals using the hydrogen masers as flywheel oscillators.
“The four frequency ratios in Eq. 5 were not measured simultaneously and need to be extrapolated to common intervals using the hydrogen masers as flywheel oscillators 34,35,85 .”
From Intercontinental comparison of optical atomic clocks through very long baseline interferometry (2021) · cites this paper as [35]
Section 2 (p. 4) describes intermittent Sr-clock measurements and using hydrogen masers as local flywheel oscillators to obtain a 10-day mean ratio. But Section 5 (p. 12) says the TAI-to-SI ratio is derived for the same 10-day interval through a separate TAI estimation protocol; the paper does not say that all four ratios are extrapolated using the masers. (LLM, conf=0.82)
Experimental — accuracy not yet measuredThe gravitational redshift induced by the different gravitational potential at the position of the optical clocks has been accounted for in the clock systematic shifts, bringing a relative correction of -1.765(2) × 10^-14 to the frequency ratio.
“The gravitational redshift induced by the different gravitational potential at the position of the optical clocks 34,35 has been accounted for in the clock systematic shifts, bringing a relative correction of -1.765(2) × 10 -14 to the frequency ratio.”
From Intercontinental comparison of optical atomic clocks through very long baseline interferometry (2021) · cites this paper as [35]
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Experimental — accuracy not yet measuredThey used the VLBI frequency link to compare two optical clocks: IT-Yb1 at INRIM in Torino and NICT-Sr1 in Koganei.
“We used this VLBI frequency link to compare two optical clocks: the ytterbium-171 optical lattice clock 34 IT-Yb1 at INRIM in Torino (Italy) and the strontium-87 optical lattice clock 35,36 NICT-Sr1 in Koganei.”
From Intercontinental comparison of optical atomic clocks through very long baseline interferometry (2021) · cites this paper as [35]
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Cites
Systematic evaluation of an atomic clock at 2 × 10−18 total uncertainty
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Towards a redefinition of the second based on optical atomic clocks
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Realization of a timescale with an accurate optical lattice clock
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The<sup>87</sup>Sr optical frequency standard at PTB
Falke, S., Schnatz, H., Winfred, J. S. R. V., Middelmann, T., Vogt, S., Weyers, S., Lipphardt, B., Grosche, G., Riehle, F., Sterr, U., et al. (2011) · Metrologia · doi:10.1088/0026-1394/48/5/022 · Cited by 129 · see citing works
Intermittent optical frequency measurements to reduce the dead time uncertainty of frequency link
Hachisu, H., & Ido, T. (2015) · Japanese Journal of Applied Physics · doi:10.7567/jjap.54.112401 · Cited by 48 · see citing works
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Research works printed but not linked: 6
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Cited by
Sorted by citations
Geodesy and metrology with a transportable optical clock
Grotti, J., Koller, S., Vogt, S., Häfner, S., Sterr, U., Lisdat, C., Denker, H., Voigt, C., Timmen, L., Rolland, A., et al. (2018) · Nature Physics · doi:10.1038/s41567-017-0042-3 · Cited by 495 · see citing works
Frequency ratio measurements at 18-digit accuracy using an optical clock network
Boulder Atomic Clock Optical Network (BACON) Collaboration*, Beloy, K., Bodine, M. I., Bothwell, T., Brewer, S. M., Bromley, S. L., Chen, J.-S., Deschênes, J.-D., Diddams, S. A., Fasano, R. J., et al. (2021) · Nature · doi:10.1038/s41586-021-03253-4 · Cited by 390 · see citing works
Mehlstäubler, T. E., Grosche, G., Lisdat, C., Schmidt, P. O., & Denker, H. (2018) · Reports on Progress in Physics · doi:10.1088/1361-6633/aab409 · Cited by 263 · see citing works
Intercontinental comparison of optical atomic clocks through very long baseline interferometry
Pizzocaro, M., Sekido, M., Takefuji, K., Ujihara, H., Hachisu, H., Nemitz, N., Tsutsumi, M., Kondo, T., Kawai, E., Ichikawa, R., et al. (2021) · Nature Physics · doi:10.1038/s41567-020-01038-6 · Cited by 64 · see citing works
Self-citationSchwarz, R., Dörscher, S., Al-Masoudi, A., Benkler, E., Legero, T., Sterr, U., Weyers, S., Rahm, J., Lipphardt, B., & Lisdat, C. (2020) · Physical Review Research · doi:10.1103/physrevresearch.2.033242 · Cited by 64 · see citing works
Advanced Satellite-Based Frequency Transfer at the 10<sup>−16</sup> Level
Fujieda, M., Yang, S.-H., Gotoh, T., Hwang, S.-W., Hachisu, H., Kim, H., Lee, Y. K., Tabuchi, R., Ido, T., Lee, W.-K., et al. (2018) · IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control · doi:10.1109/tuffc.2018.2821159 · Cited by 55 · see citing works
Self-citationHuang, Y., Zhang, H., Zhang, B., Hao, Y., Guan, H., Zeng, M., Chen, Q., Lin, Y., Wang, Y., Cao, S., et al. (2020) · Physical Review A · doi:10.1103/physreva.102.050802 · Cited by 52 · see citing works
Baynham, C. F. A., Godun, R. M., Jones, J. M., King, S. A., Nisbet-Jones, P. B. R., Baynes, F., Rolland, A., Baird, P. E. G., Bongs, K., Gill, P., et al. (2018) · Journal of Modern Optics · doi:10.1080/09500340.2017.1384514 · Cited by 32 · see citing works
- Authors
- Hachisu, H., Petit, G., Nakagawa, F., Hanado, Y., & Ido, T.
- Venue
- Optics Express
- Publisher
- Optica Publishing Group
- Published
- 2017-04-03
- Volume
- 25
- Issue
- 8
- Pages
- 8511
- ISSN
- 1094-4087 (ISSN-L)
- OpenAlex
- W2605002306
- Cited by
- 53
- References
- 5
- Citations by year
- 2026: 2 · 2024: 4 · 2023: 5 · 2022: 7 · 2021: 6 · 2020: 9 · 2019: 5 · 2018: 10 · 2017: 5
- FWCI
- 3.89
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Optics Express (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Funders
- Japan Society for the Promotion of Science (JSPS)
- MAEDI
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Frequency and Time Standards
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Scientific Measurement and Uncertainty Evaluation
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced Electrical Measurement Techniques
- Keywords
- optical frequency measurement, SI traceability, frequency metrology, cesium fountain, primary frequency standard
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