Frequency Comparison of Two High-Accuracy Al + Optical Clocks
Open accessAbstract
We have constructed an optical clock with a fractional frequency inaccuracy of 8.6x10{-18}, based on quantum logic spectroscopy of an Al+ ion. A simultaneously trapped Mg+ ion serves to sympathetically laser cool the Al+ ion and detect its quantum state. The frequency of the {1}S{0}<-->{3}P{0} clock transition is compared to that of a previously constructed Al+ optical clock with a statistical measurement uncertainty of 7.0x10{-18}. The two clocks exhibit a relative stability of 2.8x10{-15}tau{-1/2}, and a fractional frequency difference of -1.8x10{-17}, consistent with the accuracy limit of the older clock.
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Optical clocks operate at frequencies about five orders of magnitude higher than caesium clocks and thus achieve higher frequency stability, approaching fractional stabilities and uncertainties of one part in 10^18.
“The optical clocks operate at frequencies about five orders of magnitude higher than the caesium clocks and thus achieve a higher frequency stability, approaching fractional stabilities and uncertainties of one part in 10 18 (Chou et al. 2010;Hinkley et al. 2013;Bloom et al. 2014;Nicholson et al. 2015;Ushijima et al. 2015;Huntemann et al. 2016).”
From Geodetic methods to determine the relativistic redshift at the level of 10 $$^{-18}$$ - 18 in the context of international timescales: a review and practical results (2018) · cites this paper as Chou et al. 2010
The frequency stability and uncertainty of the latest generation of optical atomic clocks is now approaching one part in 10^18.
“The frequency stability and uncertainty of the latest generation of optical atomic clocks is now approaching the one part in 10 18 level.”
From Geodetic methods to determine the relativistic redshift at the level of 10 $$^{-18}$$ - 18 in the context of international timescales: a review and practical results (2018) · cites this paper as Chou et al. 2010
Current generation optical atomic clocks report fractional performance below the 10^-17 level.
“with the current generation of optical atomic clocks reporting fractional performance below the 10 -17 level 1-5 .”
From Atomic clock performance enabling geodesy below the centimetre level (2018) · cites this paper as [1]
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“The optical clocks operate at frequencies about five orders of magnitude higher than the caesium clocks and thus achieve a higher frequency stability, approaching fractional stabilities and uncertainties of one part in 1018 (Chou et al. 2010; Hinkley et al. 2013; Bloom et al. 2014; Nicholson et al. 2015; Ushijima et a…”
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- Authors
- Chou, C., Hume, D., Koelemeij, J., Wineland, D., & Rosenband, T.
- Affiliations
- National Institute of Standards and Technology (US)
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2010-02-17
- Volume
- 104
- Issue
- 7
- Pages
- 070802-070802
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W1979599337
- Cited by
- 903
- References
- 22
- Citations by year
- 2026: 7 · 2025: 22 · 2024: 25 · 2023: 32 · 2022: 24 · 2021: 39 · 2020: 39 · 2019: 58 · 2018: 65 · 2017: 55 · 2016: 71 · 2015: 88 · 2014: 107 · 2013: 96 · 2012: 76
- FWCI
- 45.60
- Type
- journal article
- Language
- en
- Open access
- green
- research.vu.nl
- Licence
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- VU Research Portal (publishedVersion, other-oa)
- arXiv (Cornell University) (submittedVersion)
- Digital Academic REpository of VU University Amsterdam (Vrije Universiteit Amsterdam) (submittedVersion)
- Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
- arXiv (Cornell University) (public-domain)
- Funders
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
- National Institute of Standards and Technology
- Office of Naval Research
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Frequency and Time Standards
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Keywords
- optical atomic clocks, Mg+ ions, quantum logic spectroscopy, fractional frequency instability, trapped ions, 1S0-3P0 transition
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