Experimental study of magnetically insensitive transitions in ultracold Fermi gas of $^{40}$K
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866917248475594752 |
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| author | Shan, Biao Huang, Lianghui Yang, Yajing Zhao, Yuhang Shen, Jiahui Ye, Zhuxiong Chen, Liangchao Meng, Zengming Wang, Pengjun Han, Wei Zhang, Jing |
| author_facet | Shan, Biao Huang, Lianghui Yang, Yajing Zhao, Yuhang Shen, Jiahui Ye, Zhuxiong Chen, Liangchao Meng, Zengming Wang, Pengjun Han, Wei Zhang, Jing |
| contents | This paper presents an experimental study of microwave single-photon transitions that are magnetic-field-insensitive in degenerate Fermi gases of $^{40}$K. This contrasts with microwave single-photon clock transitions for 0-0 magnetic-field-insensitive states and two-photon clock transitions for non 0-0 magnetic-field-insensitive states in bosonic alkali metal atoms. We show that there are two sets of special transitions between two different hyperfine ground states ($|F$=9/2, $m_{F}$=1/2$\rangle$ $\Leftrightarrow$ $|$7/2, -1/2$\rangle$ and $|$9/2, -1/2$\rangle$ $\Leftrightarrow$ $|$7/2, 1/2$\rangle$), whose microwave single-photon transition frequency is insensitive to low magnetic fields, as the first-order Zeeman shift is almost completely canceled. By using the microwave spectrum and Ramsey interference fringes, we demonstrate the long-time stability of the coherent transition under magnetic field fluctuations. These magnetic-field-insensitive microwave hyperfine transitions in ultracold $^{40}$K Fermi gases offer promising applications in quantum information and precision measurements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_12800 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Experimental study of magnetically insensitive transitions in ultracold Fermi gas of $^{40}$K Shan, Biao Huang, Lianghui Yang, Yajing Zhao, Yuhang Shen, Jiahui Ye, Zhuxiong Chen, Liangchao Meng, Zengming Wang, Pengjun Han, Wei Zhang, Jing Quantum Gases This paper presents an experimental study of microwave single-photon transitions that are magnetic-field-insensitive in degenerate Fermi gases of $^{40}$K. This contrasts with microwave single-photon clock transitions for 0-0 magnetic-field-insensitive states and two-photon clock transitions for non 0-0 magnetic-field-insensitive states in bosonic alkali metal atoms. We show that there are two sets of special transitions between two different hyperfine ground states ($|F$=9/2, $m_{F}$=1/2$\rangle$ $\Leftrightarrow$ $|$7/2, -1/2$\rangle$ and $|$9/2, -1/2$\rangle$ $\Leftrightarrow$ $|$7/2, 1/2$\rangle$), whose microwave single-photon transition frequency is insensitive to low magnetic fields, as the first-order Zeeman shift is almost completely canceled. By using the microwave spectrum and Ramsey interference fringes, we demonstrate the long-time stability of the coherent transition under magnetic field fluctuations. These magnetic-field-insensitive microwave hyperfine transitions in ultracold $^{40}$K Fermi gases offer promising applications in quantum information and precision measurements. |
| title | Experimental study of magnetically insensitive transitions in ultracold Fermi gas of $^{40}$K |
| topic | Quantum Gases |
| url | https://arxiv.org/abs/2601.12800 |