31 citations · 184 across the 10 of their papers we have counts for
10 papers
Superradiant phase transitions in the quantum Rabi model: Overcoming the no-go theorem through anisotropy
Tian Ye, Yan-Zhi Wang, Xiang-You Chen +2
Although the superradiant phase transition (SRPT) is prohibited in the paradigmatic quantum Rabi model due to the no-go theorem caused by the term, we demonstrate tw…
Phase Transitions in the Anisotropic Dicke-Stark Model with -square terms
Xiang-You Chen, Yu-Yu Zhang, Qing-Hu Chen +1
The superradiant phase transition (SRPT) is forbidden in the standard isotropic Dicke model due to the so-called no-go theorem induced by A-square term. In the framework of the Dic…
Multiple ground-state instabilities in the anisotropic quantum Rabi model
Xiang-You Chen, Liwei Duan, Daniel Braak +1
In this work, the anisotropic variant of the quantum Rabi model with different coupling strengths of the rotating and counter-rotating wave terms is studied by the Bogoliubov opera…
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-…
Generalized coherent-squeezed-state expansion for the quantum Rabi model
Xiang-You Chen, Yu-Yu Zhang, Hang Zheng
We develop a systematic variational coherent-squeezed-state expansion for the ground state of the quantum Rabi model, which includes an additional squeezing effect with comparisons…
Finite-size scaling analysis in the two-photon Dicke model
Xiang-You Chen, Yu-Yu Zhang
The Hamiltonian of the two-photon Dicke model is diagonalized for the normal phase and super-radiant phase beyond the mean-field method respectively, giving the critical coupling s…
Analytical solutions by squeezing to the anisotropic Rabi model in the nonperturbative deep-strong coupling regime
Yu-Yu Zhang, Xiang-You Chen
A novel, unexplored nonperturbative deep-strong coupling (npDSC) achieved in superconducting circuits has been studied in the anisotropic Rabi model by the generalized squeezing ro…
Analytical solutions and genuine multipartite entanglement of the three-qubit Dicke model
Yu-Yu Zhang, Xiang-You Chen, Shu He +1
We present analytical solutions to three qubits and a single-mode cavity coupling system beyond the rotating-wave approximation (RWA). The zero-th order approximation gives correct…
Large-N scaling behavior of the quantum fisher information in the Dicke model
Yu-Yu Zhang, Xiang-You Chen
Quantum Fisher information (QFI) of the reduced two-atom state is employed to capture the quantum criticality of the superradiant phase transition in the Dicke model in the infinit…