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Observation of $^1\!S_0$$\rightarrow$$^3\!P_0$ Transition of a $^{40}$Ca$^+$-$^{27}$Al$^+$ Quantum Logic Clock |
| Si-Jia Chao1,2,3, Kai-Feng Cui1,2, Shao-Mao Wang1,2,3, Jian Cao1,2**, Hua-Lin Shu1,2**, Xue-Ren Huang1,2** |
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 Atom Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
3University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Si-Jia Chao, Kai-Feng Cui, Shao-Mao Wang et al 2019 Chin. Phys. Lett. 36 120601 |
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Abstract We report the realization of quantum logic spectroscopy on the $^1\!S_0\rightarrow {}^3\!P_0$ clock transition of a single $^{27}$Al$^+$ ion. This ion is trapped together with a $^{40}$Ca$^+$ ion in a linear Paul trap, coupled by Coulomb repulsion, which provides sympathetic Doppler laser cooling and also the means for internal state detection of the clock state of the $^{27}$Al$^+$ ion. A repetitive quantum nondemolition measurement is performed to improve the fidelity of state detection. These techniques are applied to obtain clock spectroscopy at approximately 45 Hz. We also perform the preliminary locking on the $^1\!S_0\rightarrow {}^3\!P_0$ clock transition. Our work is a fundamental step that is necessary toward obtaining an ultra-precision quantum logic clock based on $^{40}$Ca$^+$-$^{27}$Al$^+$ ions.
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Received: 09 September 2019
Published: 25 November 2019
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| Fund: Supported by the National Key R&D Program of China under Grant No 2017YFA0304401, the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No XDB21030100, and the Technical Innovation Program of Hubei Province under Grant No 2018AAA045. |
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