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Title: Variational approach to time-dependent fluorescence of a driven qubit
Authors: Yan, Yiying
Chen, Lipeng
Luo, JunYan
Zhao, Yang
Keywords: Engineering::Materials
Issue Date: 2020
Source: Yan, 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.102.023714
Journal: Physical Review A 
Abstract: We 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.
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.102.023714
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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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