111 citations · 513 across the 33 of their papers we have counts for
35 papers
Extensively degenerate superradiant phase in a giant-atom quantum Rabi ring
Shu He, Li-Wei Duan
We show that an -site quantum Rabi ring with matched giant-atom couplings has degenerate superradiant configurations as the atomic-to-cavity frequency ratio tends…
Excitation Gap of a Confined Chiral Mode Measures Critical Zero-Point Fluctuations
Shu He, Liwei Duan
Where uniform and chiral superradiant boundaries meet in a quantum Rabi ring, the quadratic theory leaves a degenerate chiral ladder with finite radial width. We show that adding o…
Nonequilibrium energy transport in driven-dissipative quantum systems
Junran Kong, Yuwei Lu, Huan Liu +2
Nonequilibrium energy transport serves as one of fundamental problems in quantum thermodynamics and quantum technologies. Driven quantum master equation in the dressed picture prov…
Analytical Study of the Non-Hermitian Semiclassical Rabi Model
Yibo Liu, Liwei Duan, Qing-Hu Chen
The symmetric semiclassical Rabi model explores the fundamental interaction between a two-level atom and a classical field, revealing novel phenomena in open systems…
Vacuum Rabi Splitting and Quantum Fisher Information of a Non-Hermitian Qubit in a Single-Mode Cavity
Yi-Cheng Wang, Jiong Li, Li-Wei Duan +1
A natural extension of the non-Hermitian qubit is to place it in a single-mode cavity. This setup corresponds to the quantum Rabi model (QRM) with a purely imaginary bias on the qu…
-symmetric quantum Rabi model: Solutions and exceptional points
Jiong Li, Yi-Cheng Wang, Li-Wei Duan +1
The -symmetric non-Hermitian quantum Rabi model (QRM) with imaginary coupling is solved using the Bogoliubov operators approach. A transcendental function responsible…
Quantum phase transitions in the triangular coupled-top model
Liwei Duan, Yan-Zhi Wang, Qing-Hu Chen
We study the coupled-top model with three large spins located on a triangle. Depending on the coupling strength, there exist three phases: disordered paramagnetic phase, ferromagne…
Quantum walk for SU(1,1)
Liwei Duan
We propose a scheme to implement the quantum walk for SU(1,1) in the phase space, which generalizes those associated with the Heisenberg-Weyl group. The movement of the walker desc…
Ultrafast adiabatic passages in ultrastrongly coupled light-matter systems
Xun Gao, Liwei Duan, Pinghua Tang +4
We have obtained the solutions of the multimode quantum Rabi model when all modes have identical frequencies , including dark states with at least $(K=1,2,3,\l…
Unified approach to the nonlinear Rabi models
Liwei Duan
An analytical approach is proposed to study the two-photon, two-mode and intensity-dependent Rabi models. By virtue of the su(1,1) Lie algebra, all of them can be unified to the sa…
Quantum walk on the Bloch sphere
Liwei Duan
A scheme for implementing the discrete-time quantum walk on the Bloch sphere is proposed, which is closely related to the SU(2) group. A spin cluster serves as the walker, whereas…
Quantum phase transition in the one-dimensional Dicke-Hubbard model with coupled qubits
Shu He, Li-Wei Duan, Yan-Zhi Wang +2
We study the ground state phase diagram of a one-dimensional two qubits Dicke-Hubbard model with XY qubit-qubit interaction. We use a numerical method combing the cluster mean-fiel…
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…
Single-photon scattering controlled by an imperfect cavity
Liwei Duan, Qing-Hu Chen
We study the single-photon transport in the coupled-resonator waveguide (CRW) controlled by an imperfect cavity. A Lorentzian spectrum is introduced to describe the dissipation. We…
symmetry of a square-wave modulated two-level system
Liwei Duan, Yan-Zhi Wang, Qing-Hu Chen
We study a non-Hermitian two-level system with square-wave modulated dissipation and coupling. Based on the Floquet theory, we achieve an effective Hamiltonian from which the bound…
Quantum tricritical point emerging in the spin-boson model with two dissipative spins in staggered biases
Yan-Zhi Wang, Shu He, Liwei Duan +1
We study the spin-boson model (SBM) with two spins in staggered biases by a numerically exact method based on variational matrix product states. Several observables such as the mag…
Rich phase diagram of quantum phases in the anisotropic subohmic spin-boson model
Yan-Zhi Wang, Shu He, Liwei Duan +1
We study the anisotropic spin-boson model (SBM) with the subohmic bath by a numerically exact method based on variational matrix product states. A rich phase diagram is found in th…
Quantum Zeno effect in the multimode quantum Rabi model
Shu He, Chen Wang, Xue-Zao Ren +2
We study the quantum Zeno effect (QZE) and quantum anti-Zeno effect (QAZE) of the multimode quantum Rabi model(MQRM). We derive an analytic expression for the decay rate of the sur…
Quantum phase transitions in the spin-boson model without the counterrotating terms
Yan-Zhi Wang, Shu He, Liwei Duan +1
We study the spin-boson model without the counterrotating terms by a numerically exact method based on variational matrix product states. Surprisingly, the second-order quantum pha…
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…
Improved Silbey-Harris polaron ansatz for the spin-boson model
Shu He, Liwei Duan, Qing-Hu Chen
In this paper, the well-known Silbey-Harris (SH) polaron ansatz for the spin-boson model is improved by adding orthogonal displaced Fock states. The obtained results for the ground…
Zeno effect of the open quantum system in the presence of 1/f noise
Shu He, Chen Wang, Li-Wei Duan +1
We study the quantum Zeno effect (QZE) and quantum anti-Zeno effect (QAZE) in a two-level system(TLS) interacting with an environment owning 1/f noise. Using a numerically exact me…