Out‐of‐Time‐Order Correlators and Quantum Phase Transitions in the Rabi and Dicke Models

ZH Sun, JQ Cai, QC Tang, Y Hu, H Fan - Annalen der Physik, 2020 - Wiley Online Library
The out‐of‐time‐order correlators (OTOCs) is used to study the quantum phase transitions
(QPTs) between the normal phase and the superradiant phase in the Rabi and few‐body …

Quantum nonlocality in the spin-s Heisenberg models with the Dzyaloshinskii–Moriya interaction

YX Ma, L Li, XW Hou - Quantum Information Processing, 2019 - Springer
Various measures of quantum nonlocality have been recently proposed. In this work, four
indicators of measurement-induced nonlocality are studied for quantum thermal state with …

[HTML][HTML] Diagonal entropy in many-body systems: Volume effect and quantum phase transitions

Z Wang, ZH Sun, Y Zeng, H Lang, Q Hong, J Cui… - Physics Letters A, 2020 - Elsevier
We investigate the diagonal entropy (DE) of the ground state for quantum many-body
systems, including the XY model and the Ising model with next nearest neighbor …

Diagonal entropy and topological phase transitions in extended Kitaev chains

H Qiao, ZH Sun, FX Sun, LZ Mu, Q He, H Fan - Annals of Physics, 2019 - Elsevier
We investigate the diagonal entropy for ground states of the extended Kitaev chains with
extensive pairing and hop** terms. The systems contain rich topological phases …