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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.17423 |
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| _version_ | 1866918249392766976 |
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| author | Zhang, Baolin Ma, Zixiao Huang, Yao Han, Huili Hu, Ruming Wang, Yuzhuo Zhang, Huaqing Tang, Liyan Shi, Tingyun Guan, Hua Gao, Kelin |
| author_facet | Zhang, Baolin Ma, Zixiao Huang, Yao Han, Huili Hu, Ruming Wang, Yuzhuo Zhang, Huaqing Tang, Liyan Shi, Tingyun Guan, Hua Gao, Kelin |
| contents | We report a single-ion optical clock based on the 4S_1/2-3D_5/2 transition of the 40Ca+ ion, operated in a liquid nitrogen cryogenic environment,achieving a total systematic uncertainty of 4.4E-19. We employ a refined temperature evaluation scheme to reduce the frequency uncertainty due to blackbody radiation (BBR), and the 3D sideband cooling has been implemented to minimize the second-order Doppler shift. We have precisely determined the average Zeeman coefficient of the 40Ca+ clock transition to be 14.345(40) Hz/mT^2, thereby significantly reducing the quadratic Zeeman shift uncertainty. Moreover, the cryogenic environment enables the lowest reported heating rate due to ambient electric field noise in trapped-ion optical clocks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_17423 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Liquid-Nitrogen-Cooled Ca+ Ion Optical Clock with a Systematic Uncertainty of 4.4E-19 Zhang, Baolin Ma, Zixiao Huang, Yao Han, Huili Hu, Ruming Wang, Yuzhuo Zhang, Huaqing Tang, Liyan Shi, Tingyun Guan, Hua Gao, Kelin Atomic Physics Optics We report a single-ion optical clock based on the 4S_1/2-3D_5/2 transition of the 40Ca+ ion, operated in a liquid nitrogen cryogenic environment,achieving a total systematic uncertainty of 4.4E-19. We employ a refined temperature evaluation scheme to reduce the frequency uncertainty due to blackbody radiation (BBR), and the 3D sideband cooling has been implemented to minimize the second-order Doppler shift. We have precisely determined the average Zeeman coefficient of the 40Ca+ clock transition to be 14.345(40) Hz/mT^2, thereby significantly reducing the quadratic Zeeman shift uncertainty. Moreover, the cryogenic environment enables the lowest reported heating rate due to ambient electric field noise in trapped-ion optical clocks. |
| title | A Liquid-Nitrogen-Cooled Ca+ Ion Optical Clock with a Systematic Uncertainty of 4.4E-19 |
| topic | Atomic Physics Optics |
| url | https://arxiv.org/abs/2506.17423 |