265 citations · 475 across the 19 of their papers we have counts for
20 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…
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…
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…
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…
Zeno and anti-Zeno effect in an open quantum system in the ultrastrong-coupling regime
Shu He, Qing-Hu Chen, Hang Zheng
We study the quantum Zeno effect (QZE) and quantum anti-Zeno effect (QAZE) of a two-level system interacting with an environment of harmonic oscillators, the spin-boson model. By a…
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…
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…
Exact solvability of the quantum Rabi models within Bogoliubov operators
Qing-Hu Chen, Chen Wang, Shu He +2
The quantum Rabi model can be solved exactly by the Bargmann transformation from real coordinate to complex variable recently [Phys. Rev. Lett. \textbf{107}, 100401 (2011)]. By the…
Unified analytical treatments to qubit-oscillator systems
Shu He, Yu-Yu Zhang, Qing-Hu Chen +3
An effective scheme within two displaced bosonic operators with equal positive and negative displacements is extended to study qubit-oscillator systems analytically in an unified w…
Jaynes-Cummings model: What emerges first beyond the rotating-wave approximation?
Shu He, Qing-Hu Chen, Xue-Zao Ren +2
The Jaynes-Cummings model without the rotating-wave approximation can be solved exactly by extended Swain's ansatz with the conserved parity. The analytical approximations are then…