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dc.contributor.authorYan, Yiyingen_US
dc.contributor.authorChen, Lipengen_US
dc.contributor.authorLuo, JunYanen_US
dc.contributor.authorZhao, Yangen_US
dc.identifier.citationYan, Y., Chen, L., Luo, J. Y., & Zhao, Y. (2020). Variational approach to time-dependent fluorescence of a driven qubit. Physical Review A, 102(2), 023714-. doi:10.1103/physreva.102.023714en_US
dc.description.abstractWe employ the Dirac-Frenkel variational principle and the multiple Davydov ansatz to study time-dependent fluorescence spectra of a driven qubit in the weak to strong qubit-reservoir coupling regimes, where both the Rabi frequency and the spontaneous decay rate are comparable to the transition frequency of the qubit. Our method agrees well with the time-local master-equation approach in the weak coupling regime, and offers a flexible way to compute the spectra from the bosonic dynamics instead of two-time correlation functions. While the perturbative master equation breaks down in the strong coupling regime, our method actually becomes more accurate due to the use of bosonic coherent states under certain conditions. We show that the counter-rotating coupling between the qubit and the reservoir has considerable contributions to the photon number dynamics and the spectra under strong driving conditions even when the coupling is moderately weak. The time-dependent spectra are found to be generally asymmetric, a feature that is derived from photon number dynamics. In addition, it is shown that the spectral profiles can be dramatically different from the Mollow triplet due to strong dissipation and/or multiphoton processes associated with the strong driving. Our formalism provides a unique perspective to interpret time-dependent spectra.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.relation.ispartofPhysical Review Aen_US
dc.rights© 2020 American Physical Society. All rights reserved. This paper was published in Physical Review A and is made available with permission of American Physical Society.en_US
dc.titleVariational approach to time-dependent fluorescence of a driven qubiten_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsQuantum Opticsen_US
dc.subject.keywordsOptical and Lasersen_US
dc.description.acknowledgementThe authors thank Zhiguo Lü and Lu Wang for usefuldiscussions. Support from the National Natural Science Foun-dation of China (Grants No. 11647082 and No. 11774311)and the Singapore Ministry of Education Academic ResearchFund Tier 1 (Grant No. RG190/18) is gratefully acknowl-edged.en_US
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