6 papers
Double degeneracy associated with hidden symmetries in the asymmetric two-photon Rabi model
You-Fei Xie, Qing-Hu Chen
In this paper, we uncover the elusive level crossings in a subspace of the asymmetric two-photon quantum Rabi model (tpQRM) when the bias parameter of qubit is an even multiple of…
Quantum criticality of the Rabi-Stark model at finite frequency ratios
Xiang-You Chen, You-Fei Xie, Qing-Hu Chen
In this paper, we analyze the quantum criticality of the Rabi-Stark model at finite ratios of the qubit and cavity frequencies in terms of the energy gap, the order parameter, as w…
First-order and continuous quantum phase transitions in the anisotropic quantum Rabi-Stark model
You-Fei Xie, Xiang-You Chen, Xiao-Fei Dong +1
Various quantum phase transitions in the anisotropic Rabi-Stark model with both the nonlinear Stark coupling and the linear dipole coupling between a two-level system and a single-…
Quantum Rabi-Stark model: Solutions and exotic energy spectra
You-Fei Xie, Liwei Duan, Qing-Hu Chen
The quantum Rabi-Stark model, where the linear dipole coupling and the nonlinear Stark-like coupling are present on an equal footing, are studied within the Bogoliubov operators ap…
The mixed quantum Rabi model
Liwei Duan, You-Fei Xie, Qing-Hu Chen
The analytical exact solutions to the mixed quantum Rabi model (QRM) including both one- and two-photon terms are found by using Bogoliubov operators. Transcendental functions in t…
Generalized quantum Rabi model with both one- and two-photon terms: A concise analytical study
You-Fei Xie, Liwei Duan, Qing-Hu Chen
A generalized quantum Rabi Hamiltonian with both one- and two-photon terms has emerged in the circuit quantum electrodynamics system for a decade. The usual parity symmetry is brok…