| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Improvement of Stability of $^{40}$Ca$^{+}$ Optical Clock with State Preparation |
| Meng-Yan Zeng1,2,3,4, Yao Huang1,2,3, Hu Shao1,2,3,4, Miao Wang1,2,3,4, Hua-Qing Zhang1,2,3,4, Bao-Lin Zhang1,2,3,4, Hua Guan1,2,3, Ke-Lin Gao1,2,3** |
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
2Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
3Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071
4University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Meng-Yan Zeng, Yao Huang, Hu Shao et al 2018 Chin. Phys. Lett. 35 074202 |
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Abstract Stability is one of most important performances of an atomic clock. Here we describe our recent work on improving the stability of our $^{40}$Ca$^{+}$ optical clock. State preparation is adopted to transfer the ion to the ground-state magnetic sublevel of the clock transition, after the quenching laser transfers the ion to the ground state at each cycle. Using this method, the stability for $^{40}$Ca$^{+}$ optical clock is improved to about $6.3\times 10^{-15}/\sqrt\tau$. Compared with $1.0\times 10^{-14}/\sqrt \tau$ in previous work, the averaging time is decreased to reach a given level of statistical uncertainty in a clock comparison.
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Received: 26 March 2018
Published: 24 June 2018
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| PACS: |
42.62.Fi
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(Laser spectroscopy)
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37.10.Ty
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(Ion trapping)
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95.55.Sh
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(Auxiliary and recording instruments; clocks and frequency standards)
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| Fund: Supported by the National Key R&D Program of China under Grant No 2017YFA0304401, the National Natural Science Foundation of China under Grant Nos 91336211, 11634013, 11474318 and 11622434, the Strategic Priority Research Program B of Chinese Academy of Sciences under Grant No XDB21030100, the Hubei Provincial Science Fund for Distinguished Young Scholars under Grant No 2017CFA040, and the Youth Innovation Promotion Association of Chinese Academy of Sciences under Grant No 2015274. |
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