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Quantum criticality from spectral collapse in the two-photon Rabi model
Jiong Li, Jun-ling Wang, Qing-Hu Chen +1
Spectral collapse in the two-photon quantum Rabi model (tpQRM) has long been regarded as incompatible with quantum criticality due to the absence of a vanishing excitation gap. We…
Dissipative phase transitions of the Dicke-Ising model
Jun-Ling Wang, Jiong Li, Qing-Hu Chen
The dissipative phase transitions in the open transverse and longitudinal Dicke-Ising model (DIM), which incorporates nearest-neighbor Ising-type spin interactions into the Dicke f…
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 two-photon quantum Rabi models
Yi-Cheng Wang, Jiong Li, Qing-Hu Chen
We investigate two non-Hermitian two-photon quantum Rabi models (tpQRM) that exhibit symmetry: the biased tpQRM (btpQRM), in which the qubit bias is purely imaginary…
Critical Spectrum and Quantum Criticality in the Two-Photon Rabi-Stark Model
Jiong Li, Qing-Hu Chen
We investigate the spectral properties and quantum criticality of the two-photon Rabi-Stark model. Using the exact solution of this model, we rigorously derive a condition for comp…
-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…