88⁢Sr+ optical clock with 7.9 ×10−19 systematic uncertainty and measurement of its absolute frequency with 9.8 ×10−17 uncertainty

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F25%3AN0000004" target="_blank" >RIV/00177016:_____/25:N0000004 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prapplied/abstract/10.1103/czlf-bfvp" target="_blank" >https://journals.aps.org/prapplied/abstract/10.1103/czlf-bfvp</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/czlf-bfvp" target="_blank" >10.1103/czlf-bfvp</a>

Result language
angličtina
Original language name
88⁢Sr+ optical clock with 7.9 ×10−19 systematic uncertainty and measurement of its absolute frequency with 9.8 ×10−17 uncertainty
Original language description
We report on a 88⁢Sr+ single-ion optical clock with an estimated fractional systematic uncertainty of 7.9×10−19. The low uncertainty is enabled by small rf losses, a thorough evaluation of the blackbody-radiation temperature, and our recent measurement of the differential polarizability. A detailed uncertainty evaluation is presented. We also report on two absolute frequency measurements: one against a remote cesium fountain clock, and one against International Atomic Time (TAI). The former lasted 12 d and resulted in a frequency value of 444 779 044 095 485.49(15) Hz. The latter spanned 10 months with monthly optical-clock uptimes between 68% and 99%, and yielded a frequency value of 444 779 044 095 485.373(44) Hz. With a fractional uncertainty of 9.8×10−17, it is, to our knowledge, the most accurate optical frequency measurement reported to date. Both frequency values are in agreement with other recent measurements, providing further evidence that the 2021 CIPM recommended frequency value is too high by 1.6 times its uncertainty.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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