Absolute frequency measurement with uncertainty below $1\times 10^{-15}$ using International Atomic Time
| Autor: | Hidekazu Hachisu, Tetsuya Ido, Gérard Petit |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Systematic error Physics and Astronomy (miscellaneous) Scale (ratio) International Atomic Time Atomic Physics (physics.atom-ph) Absolute frequency Evaluation Interval General Engineering General Physics and Astronomy FOS: Physical sciences Interval (mathematics) Frequency standard 01 natural sciences Computational physics Physics - Atomic Physics 010309 optics 0103 physical sciences Calibration Atomic physics 010306 general physics Optics (physics.optics) Physics - Optics |
| Popis: | The absolute frequency of the $^{87}{\rm Sr}$ clock transition measured in 2015 was reevaluated using an improved frequency link to the SI second. The scale interval of International Atomic Time (TAI) that we used as the reference was calibrated for an evaluation interval of five days instead of the conventional interval of one month which is regularly employed in Circular T. The calibration on a five-day basis removed the uncertainty in assimilating the TAI scale of the five-day mean to that of the one-month mean. The reevaluation resulted in the total uncertainty of $10^{-16}$ level for the first time without local cesium fountains. Since there are presumably no correlations among systematic shifts of cesium fountains worldwide, the measurement is not limited by the systematic uncertainty of a specific primary frequency standard. Applied Physics B, in press |
| Databáze: | OpenAIRE |
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