111 citations · 268 across the 9 of their papers we have counts for
9 papers
General symmetry operators of the asymmetric quantum Rabi model
You-Fei Xie, Qing-Hu Chen
The true level crossing in the asymmetric quantum Rabi model without any obvious symmetry can be exhibited in the energy spectrum if the qubit bias is a multiple of the cavity freq…
Symmetry operators of the asymmetric two-photon quantum Rabi model
You-Fei Xie, Qing-Hu Chen
The true level crossings in a subspace of the asymmetric two-photon quantum Rabi model (tpQRM) have been observed when the bias parameter of qubit is an even multiple of the renorm…
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…
Two-photon Rabi model: Analytic solutions and spectral collapse
Liwei Duan, You-Fei Xie, Daniel Braak +1
The two-photon quantum Rabi model with quadratic coupling is studied using extended squeezed states and we derive -functions for Bargmann index and . The simple sin…