



@article {2715,
	title = {Approximating the two-mode two-photon Rabi model},
	journal = {Physics Letters A},
	volume = {422},
	year = {2022},
	month = {01/17/2022},
	chapter = {127779},
	abstract = {<p>The Rabi model describes the simplest nontrivial interaction between a few-level system and a bosonic mode, featuring in multiple seemingly unrelated systems of importance to quantum science and technology. While exact expressions for the energies of this model and its few-mode extensions have been obtained, they involve roots of transcendental functions and are thus cumbersome and unintuitive. Utilizing the symmetric generalized rotating wave approximation (S-GRWA), we develop a family of approximations to the energies of the two-mode two-photon Rabi model. The simplest elements of the family are analytically tractable, providing good approximations in regimes of interest such as ultra- and deep-strong coupling. Higher-order approximate energies can be used if more accuracy is required.\&nbsp;</p>},
	doi = {https://doi.org/10.1016/j.physleta.2021.127779},
	url = {https://arxiv.org/abs/2012.06994},
	author = {David H. Wu and Victor V. Albert}
}
