| DOI | Resolve DOI: https://doi.org/10.1088/1681-7575/aca615 |
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| Author | Search for: Jian, Bin1ORCID identifier: https://orcid.org/0000-0002-4588-3957; Search for: Bernard, John1; Search for: Gertsvolf, Marina1ORCID identifier: https://orcid.org/0000-0002-1188-2104; Search for: Dubé, Pierre1ORCID identifier: https://orcid.org/0000-0003-0133-2165 |
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| Affiliation | - National Research Council of Canada. Metrology Research Centre
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| Format | Text, Article |
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| Abstract | We report on an improved absolute frequency measurement of the 5s ²S₁/₂ – 4d² D₅/₂ optical transition of a single trapped strontium ion using a Global Positioning System (GPS) link to the SI second. Compared to our previous measurement, the systematic uncertainty of the optical clock has been reduced from 1.5 × 10⁻¹⁷ to 1.2 × 10⁻¹⁷. The measurement campaign was performed over a two-week period in June 2017, with a total measurement time of 92 h. The traceability to the SI second through International Atomic Time was achieved through a GPS link using the Precise Point Positioning method. The dead time uncertainty of the link between the optical clock and the maser was evaluated using standard methods based on a model of the maser noise and on the optical frequency measurement uptimes. The measured frequency of the ⁸⁸Sr⁺ ion 5s²S₁/₂ – 4d²D₅/₂ transition is 444 779 044 095 485.49(19) Hz. This result is in excellent agreement with our previous measurements and the uncertainty has been reduced by almost a factor of four, from a fractional frequency uncertainty of 1.7 × 10⁻¹⁵ to 4.3 × 10⁻¹⁶. |
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| Publication date | 2023-12-21 |
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| Publisher | IOP |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | d8d3a3aa-2b8e-448b-b1f9-8e6bce07e15d |
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| Record created | 2024-07-26 |
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| Record modified | 2024-07-26 |
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