Multitype entanglement dynamics induced by exceptional points

As a most important feature of non-Hermitian systems, exceptional points (EPs) lead to a variety of unconventional phenomena and applications. Here, we study a generic model composed of two coupled non-Hermitian qubits; the EPs can be easily obtained in this system by adjusting the driving amplitude applied to the qubits. The diverse entanglement dynamics on the two sides of the original fourth-order EP ($\mathrm{EP}{4}^{\ensuremath{'}}$) and second-order EP (EP2) can be observed simultaneously in the weak coupling regime. With the increase of the coupling strength, the $\mathrm{EP}{4}^{\ensuremath{'}}$ is replaced by an additional EP2, leading to the disappearance of the entanglement dynamics change induced by $\mathrm{EP}{4}^{\ensuremath{'}}$ in the strong coupling regime. Considering the case of Ising-type interaction, we also realize EP-induced entanglement dynamics changing without the driving field. Our study paves the way for the investigation of EP-induced quantum effects and applications of EP-related quantum technologies.