Lamb shift and the vacuum Rabi splitting in a strongly dissipative environment
We study the vacuum Rabi splitting of a qubit ultrastrongly coupled to a high-Q cavity mode and a radiation reservoir. Three methods are employed: a numerically exact variational approach with a multiple Davydov ansatz, the rotating-wave approximation (RWA), and the transformed RWA. Agreement betwee...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/157800 |
| _version_ | 1811693233587093504 |
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| author | Yan, Yiying Ergogo, Tadele T. Lü, Zhiguo Chen, Lipeng Luo, Jun Yan Zhao, Yang |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Yan, Yiying Ergogo, Tadele T. Lü, Zhiguo Chen, Lipeng Luo, Jun Yan Zhao, Yang |
| author_sort | Yan, Yiying |
| collection | NTU |
| description | We study the vacuum Rabi splitting of a qubit ultrastrongly coupled to a high-Q cavity mode and a radiation reservoir. Three methods are employed: a numerically exact variational approach with a multiple Davydov ansatz, the rotating-wave approximation (RWA), and the transformed RWA. Agreement between the variational results and the transformed RWA results is found in the regime of validity of the latter, where the RWA breaks down completely. We illustrate that the Lamb shift plays an essential role in modifying the vacuum Rabi splitting in the ultrastrong coupling regime, leading to off-resonant qubit-cavity coupling even though the cavity frequency equals the bare transition frequency of the qubit. Specifically, the emission spectrum exhibits one broad low-frequency peak and one narrow high-frequency peak in the presence of relatively weak cavity-qubit coupling. As the cavity-qubit coupling increases, the low-frequency peak narrows while the high-frequency peak broadens until they have similar widths. |
| first_indexed | 2024-10-01T06:48:26Z |
| format | Journal Article |
| id | ntu-10356/157800 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:48:26Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1578002023-07-14T16:06:02Z Lamb shift and the vacuum Rabi splitting in a strongly dissipative environment Yan, Yiying Ergogo, Tadele T. Lü, Zhiguo Chen, Lipeng Luo, Jun Yan Zhao, Yang School of Materials Science and Engineering Science::Chemistry::Physical chemistry Cavity Mode Qubits We study the vacuum Rabi splitting of a qubit ultrastrongly coupled to a high-Q cavity mode and a radiation reservoir. Three methods are employed: a numerically exact variational approach with a multiple Davydov ansatz, the rotating-wave approximation (RWA), and the transformed RWA. Agreement between the variational results and the transformed RWA results is found in the regime of validity of the latter, where the RWA breaks down completely. We illustrate that the Lamb shift plays an essential role in modifying the vacuum Rabi splitting in the ultrastrong coupling regime, leading to off-resonant qubit-cavity coupling even though the cavity frequency equals the bare transition frequency of the qubit. Specifically, the emission spectrum exhibits one broad low-frequency peak and one narrow high-frequency peak in the presence of relatively weak cavity-qubit coupling. As the cavity-qubit coupling increases, the low-frequency peak narrows while the high-frequency peak broadens until they have similar widths. Ministry of Education (MOE) Submitted/Accepted version Support from the National Natural Science Foundation of China (Grant Nos. 12005188, 11774226, and 11774311) and the Singapore Ministry of Education Academic Research Fund Tier 1 (Grant No. RG190/18) is gratefully acknowledged. 2022-05-16T05:16:56Z 2022-05-16T05:16:56Z 2021 Journal Article Yan, Y., Ergogo, T. T., Lü, Z., Chen, L., Luo, J. Y. & Zhao, Y. (2021). Lamb shift and the vacuum Rabi splitting in a strongly dissipative environment. Journal of Physical Chemistry Letters, 12(40), 9919-9925. https://dx.doi.org/10.1021/acs.jpclett.1c02791 1948-7185 https://hdl.handle.net/10356/157800 10.1021/acs.jpclett.1c02791 34613722 40 12 9919 9925 en RG 190/18 RG 87/20 Journal of Physical Chemistry Letters This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpclett.1c02791. application/pdf |
| spellingShingle | Science::Chemistry::Physical chemistry Cavity Mode Qubits Yan, Yiying Ergogo, Tadele T. Lü, Zhiguo Chen, Lipeng Luo, Jun Yan Zhao, Yang Lamb shift and the vacuum Rabi splitting in a strongly dissipative environment |
| title | Lamb shift and the vacuum Rabi splitting in a strongly dissipative environment |
| title_full | Lamb shift and the vacuum Rabi splitting in a strongly dissipative environment |
| title_fullStr | Lamb shift and the vacuum Rabi splitting in a strongly dissipative environment |
| title_full_unstemmed | Lamb shift and the vacuum Rabi splitting in a strongly dissipative environment |
| title_short | Lamb shift and the vacuum Rabi splitting in a strongly dissipative environment |
| title_sort | lamb shift and the vacuum rabi splitting in a strongly dissipative environment |
| topic | Science::Chemistry::Physical chemistry Cavity Mode Qubits |
| url | https://hdl.handle.net/10356/157800 |
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