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Zeeman decoherence effect of trapped 199Hg+ ion Ramsey spectra |
| Ge Liu(刘格)1,2, Hao Liu(柳浩)1,†, Yihe Chen(陈义和)1, Jian Wang(王健)1,2, Shuhong Huang(黄书泓)1,2, Chengbin Li(李承斌)1,3, and Lei She(佘磊)1,‡ |
1 Key Laboratory of Atomic Frequency Standards (KLAFS), Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China |
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Abstract In the $^{199}$Hg$^{+}$ ion microwave clock, the Zeeman decoherence effect caused by the overlapping of Zeeman sidebands and the radial secular motion sidebands will decrease the contrast of the Ramsey fringe, thus reducing the signal-to-noise ratio of the spectra. In this paper, the Zeeman decoherence effect is analyzed theoretically and investigated experimentally. A simplified model is built to describe the Ramsey spectral probability, in which the transverse relaxation time $T_{{2}}$ is introduced to characterize the influence of the Zeeman decoherence effect phenomenologically. The experiments were carried out on a linear quadrupole trap $^{199}$Hg$^{+}$ ion clock. The results show that the probability model matches well with the experimental data, and the magnetic field value should be more than 150 mGs (1 Gs = 10$^{-4}$ T) to avoid the Zeeman decoherence effect.
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Received: 14 June 2024
Revised: 05 September 2024
Accepted manuscript online: 14 September 2024
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PACS:
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37.10.Ty
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(Ion trapping)
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32.10.Fn
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(Fine and hyperfine structure)
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32.30.-r
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(Atomic spectra?)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFB3904002). |
Corresponding Authors:
Hao Liu, Lei She
E-mail: liuhao@apm.ac.cn;shelei@apm.ac.cn
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Cite this article:
Ge Liu(刘格), Hao Liu(柳浩), Yihe Chen(陈义和), Jian Wang(王健), Shuhong Huang(黄书泓), Chengbin Li(李承斌), and Lei She(佘磊) Zeeman decoherence effect of trapped 199Hg+ ion Ramsey spectra 2024 Chin. Phys. B 33 113702
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