Ehrenfest Modeling of Cavity Vacuum Fluctuations and How to Achieve Emission from a Three-Level Atom

• URL: http://arxiv.org/abs/2309.01912v2
• Date: Tue, 12 Dec 2023 14:43:50 GMT
• Title: Ehrenfest Modeling of Cavity Vacuum Fluctuations and How to Achieve Emission from a Three-Level Atom
• Authors: Ming-Hsiu Hsieh, Alex Krotz, Roel Tempelaar
• Abstract summary: A classical cavity field interacts self-consistently with quantum states of matter through Ehrenfest's theorem. We introduce a modified mean-field approach, referred to as decoupled mean-field (DC-MF) dynamics. We show DC-MF to provide an improved description of reabsorption and (resonant) two-photon emission processes.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A much-needed solution for the efficient modeling of strong coupling between matter and optical cavity modes is offered by mean-field mixed quantum--classical dynamics, where a classical cavity field interacts self-consistently with quantum states of matter through Ehrenfest's theorem. We previously introduced a modified mean-field approach, referred to as decoupled mean-field (DC-MF) dynamics, wherein vacuum fluctuations of the cavity field are decoupled from the quantum-mechanical ground state as a means to resolve an unphysical drawing of energy from the vacuum fluctuations by a two-level atom. Here, we generalize DC-MF dynamics for an arbitrary number of (nondegenerate) atomic levels, and show that it resolves an unphysical lack of emission from a three-level atom predicted by conventional mean-field dynamics. We furthermore show DC-MF to provide an improved description of reabsorption and (resonant) two-photon emission processes.

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