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Title: Lamb shift and the vacuum Rabi splitting in a strongly dissipative environment
Authors: Yan, Yiying
Ergogo, Tadele T.
Lü, Zhiguo
Chen, Lipeng
Luo, Jun Yan
Zhao, Yang
Keywords: Science::Chemistry::Physical chemistry
Issue Date: 2021
Source: 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.
Project: RG 190/18 
RG 87/20 
Journal: Journal of Physical Chemistry Letters 
Abstract: 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.
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.1c02791
Schools: School of Materials Science and Engineering 
Rights: 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
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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