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Realization of a timescale with an accurate optical lattice clock
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Optical clocks are not only powerful tools for prime fundamental research, but are also deemed for the re-definition of the SI base unit second as they now surpass the performance of caesium atomic clocks in both accuracy and stability by more than an order of magnitude. However, an important obstacle in this transition has so far been the limited reliability of the optical clocks that made a continuous realization of a timescale impractical. In this paper, we demonstrate how this situation can be resolved and that a timescale based on an optical clock can be established that is superior to one based on even the best caesium fountain clocks. The paper also gives further proof of the international consistency of strontium lattice clocks on the $10^{-16}$ accuracy level, which is another prerequisite for a change in the definition of the second.
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“This international all-optical clock measurement surpasses the accuracy of the best possible comparison achievable by measurements against primary caesium clocks by one order of magnitude5212223.”
From A clock network for geodesy and fundamental science (2016) · cites this paper as [22]
Experimental — accuracy not yet measuredThe source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
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“The accuracy of the former method is limited by the caesium microwave clocks with the most stringent bound set by our groups5212223 at an agreement within 4 × 10−16”
From A clock network for geodesy and fundamental science (2016) · cites this paper as [22]
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“After accounting for a linear drift, the dominant contribution to the extrapolation uncertainty is due to the stochastic maser behaviour 42,43,86 .”
From Intercontinental comparison of optical atomic clocks through very long baseline interferometry (2021) · cites this paper as [43]
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“The details of the actual implementation of state preparation and interrogation being quite different in the two experimental realizations of a Sr lattice clock5212223, systematic and statistical uncertainties are highly independent and uncorrelated.”
From A clock network for geodesy and fundamental science (2016) · cites this paper as [22]
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Metadata
- Authors
- Grebing, C., Al-Masoudi, A., Dörscher, S., Häfner, S., Gerginov, V., Weyers, S., Lipphardt, B., Riehle, F., Sterr, U., & Lisdat, C.
- Venue
- Optica
- Publisher
- Optica Publishing Group
- Published
- 2016-05-25
- Volume
- 3
- Issue
- 6
- Pages
- 563
- ISSN
- 2334-2536 (ISSN-L)
- OpenAlex
- W2295004978
- Cited by
- 149
- References
- 47
- Citations by year
- 2026: 8 · 2025: 11 · 2024: 10 · 2023: 13 · 2022: 11 · 2021: 9 · 2020: 22 · 2019: 21 · 2018: 26 · 2017: 12 · 2016: 6
- FWCI
- 10.25
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Optica (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Centre of Quantum Engineering and Space-Time Research (QUEST)
- German Research Foundation (DFG) (RTG 1729, CRC 1128)
- International Timescales with Optical Clocks (ITOC)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Frequency and Time Standards
- Physical Sciences › Computer Science › Computer Networks and Communications › Network Time Synchronization Technologies
- Physical Sciences › Physics and Astronomy › Instrumentation › Scientific Measurement and Uncertainty Evaluation
- Keywords
- optical lattice clock, redefinition of the second, clock frequency stability
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