Autler-Townes spectroscopy of a Rydberg ladder
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arXiv
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| Format: | Preprint |
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2025
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| author | Xiang, Tai Lu, Yue-Hui Ho, Jacquelyn Lee, Tsai-Chen Yan, Zhenjie Stamper-Kurn, Dan M. |
| author_facet | Xiang, Tai Lu, Yue-Hui Ho, Jacquelyn Lee, Tsai-Chen Yan, Zhenjie Stamper-Kurn, Dan M. |
| contents | Ladder-type two-photon excitation of an atom from a ground state $|g\rangle$, to an intermediate excited state $|e\rangle$, and, finally, to a Rydberg state $|r\rangle$, has a variety of uses from quantum information to sensing. A common scheme for detecting this transition optically is through electromagnetically induced transparency (EIT). However, in inverted wavelength schemes, where the ground-to-excited transition wavelength is shorter than the excited-to-Rydberg transition wavelength, the strength of the EIT feature on the lower-leg beam is strongly reduced in a Doppler-broadened medium. Here, we report on an alternative two-photon spectroscopic feature, which we term the two-photon Autler-Townes resonance, observed on the upper-leg beam. Compared to the EIT signal, this feature's superior signal-to-noise ratio allows one to resolve Rydberg resonances with principal quantum number as high as $n=80$. We also show that such a feature can be utilized to generate an error signal for stabilizing the frequency of the upper-leg beam. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_13150 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Autler-Townes spectroscopy of a Rydberg ladder Xiang, Tai Lu, Yue-Hui Ho, Jacquelyn Lee, Tsai-Chen Yan, Zhenjie Stamper-Kurn, Dan M. Quantum Physics Atomic Physics Ladder-type two-photon excitation of an atom from a ground state $|g\rangle$, to an intermediate excited state $|e\rangle$, and, finally, to a Rydberg state $|r\rangle$, has a variety of uses from quantum information to sensing. A common scheme for detecting this transition optically is through electromagnetically induced transparency (EIT). However, in inverted wavelength schemes, where the ground-to-excited transition wavelength is shorter than the excited-to-Rydberg transition wavelength, the strength of the EIT feature on the lower-leg beam is strongly reduced in a Doppler-broadened medium. Here, we report on an alternative two-photon spectroscopic feature, which we term the two-photon Autler-Townes resonance, observed on the upper-leg beam. Compared to the EIT signal, this feature's superior signal-to-noise ratio allows one to resolve Rydberg resonances with principal quantum number as high as $n=80$. We also show that such a feature can be utilized to generate an error signal for stabilizing the frequency of the upper-leg beam. |
| title | Autler-Townes spectroscopy of a Rydberg ladder |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2510.13150 |