Ehrenfest modeling of cavity vacuum fluctuations and how to achieve emission from a three-level atom

Ming Hsiu Hsieh, Alex Krotz, Roel Tempelaar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number221104
JournalJournal of Chemical Physics
Volume159
Issue number22
DOIs
StatePublished - Dec 14 2023

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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