Emission spectral non-Markovianity in qubit-cavity systems in the ultrastrong coupling regime

• URL: http://arxiv.org/abs/2304.02675v1
• Date: Wed, 5 Apr 2023 18:10:20 GMT
• Title: Emission spectral non-Markovianity in qubit-cavity systems in the ultrastrong coupling regime
• Authors: Chenyi Zhang, Minghong Yu, Yiying Yan, Lipeng Chen, Zhiguo L\"u, Yang Zhao
• Abstract summary: We study the emission spectra of dissipative Rabi and Jaynes-Cummings models in the non-Markovian and ultrastrong coupling regimes.
• Score: 6.886982050140102
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the emission spectra of dissipative Rabi and Jaynes-Cummings models in the non-Markovian and ultrastrong coupling regimes. We have derived a polaron-transformed Nakajima-Zwanzig master equation (PTNZE) to calculate the emission spectra, which eliminates the well known limitations of the Markovian approximation and the standard second-order perturbation. Using the time-dependent variational approach as benchmark, the PTNZE is found to yield accurate emission spectra in certain ultrastrong coupling regimes where the standard second-order Nakajima-Zwanzig master equation breaks down. It is shown that the emission spectra of the dissipative Rabi and Jaynes-Cummings models are in general asymmetric under various initial conditions. Direct comparisons of spectra for the two models illustrate the essential role of the qubit-cavity counter-rotating term and the spectra features under different qubit-cavity coupling strengths and system initial conditions.

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