| Autor: |
Dao-Xin Liu, Jian Cao, Jin-Bo Yuan, Kai-Feng Cui, Yi Yuan, Ping Zhang, Si-Jia Chao, Hua-Lin Shu, Xue-Ren Huang |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Chinese Physics B. 32:010601 |
| ISSN: |
1674-1056 |
| DOI: |
10.1088/1674-1056/ac6337 |
| Popis: |
We report an experimental demonstration of geopotential difference measurement using a pair of transportable 40Ca+ optical clocks (TOC-729-1 and TOC-729-3) in the laboratory, each of them has an uncertainty of 1.3 × 10−17 and an instability of 4.8 × 10 − 15 / τ . Referenced to a stationary clock of TOC-729-1, the geopotential difference measurements are realized by moving TOC-729-3 to three different locations and the relevant altitude differences are measured with uncertainties at the level of 20 cm. After correcting the systematic shifts (including gravitational red shift), the two-clock frequency difference is measured to be –0.7(2.2) × 10−17, considering both the statistic (1.0 × 10−17) and the systematic (1.9 × 10−17) uncertainties. The frequency difference between these two clocks is within their respective uncertainties, verifying the reliability of transportable 40Ca+ optical clocks at the low level of 10−17. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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