265 citations · 475 across the 19 of their papers we have counts for
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Quantum phase transitions of the spin-boson model within multi-coherent-states
Liwei Duan, Shu He, Qing-Hu Chen
A variational approach based on the multi-coherent-state ansatz with asymmetric parameters is employed to study the ground state of the spin-boson model. Without any artificial app…
Solution of the two-mode quantum Rabi model using extended squeezed states
Liwei Duan, Shu He, D. Braak +1
The two-mode quantum Rabi model with bilinear coupling is studied using extended squeezed states. We derive -functions for each Bargmann index % . They share a common structu…
Absence of collapse in quantum Rabi oscillations
Shu He, Yang Zhao, Qing-Hu Chen
We show analytically that the collapse and revival in the population dynamics of the atom-cavity coupled system under the rotating wave approximation (RWA), valid only at very weak…
Quantum criticality of the sub-Ohmic spin-boson model within displaced Fock states
Shu He, Liwei Duan, Qing-Hu Chen
The spin-boson model is analytically studied using displaced Fock states (DFS) without discretization of the continuum bath. In the orthogonal displaced Fock basis, the ground-stat…
Concise analytic solutions to the quantum Rabi model with two arbitrary qubits
Liwei Duan, Shu He, Qing-Hu Chen
Using extended coherent states, an analytical exact study has been carried out for the quantum Rabi model (QRM) with two arbitrary qubits in a very concise way. The -functions w…
Exact solvability, non-integrability, and genuine multipartite entanglement dynamics of the Dicke model
Shu He, Liwei Duan, Qing-Hu Chen
In this paper, the finite size Dicke model of arbitrary number of qubits is solved analytically in an unified way within extended coherent states. For the or Dicke mo…
Solutions to the quantum Rabi model with two equivalent qubits
Hui Wang, Shu He, Liwei Duan +2
Using extended coherent states, an analytically exact study has been carried out for the quantum Rabi model with two equivalent qubits. Compact transcendental functions of one vari…