Abstract
We study the exceptional-point(EP)structure and the associated quantum dynamics in a system consisting of a non-Hermitian qubit and a Hermitian qubit.We find that the system possesses two sets of EPs,which divide the system-parameter space into PT-symmetry unbroken,partially broken and fully broken regimes,each with distinct quantum-dynamics characteristics.Particularly,in the partially broken regime,while the PT-symmetry is generally broken in the whole four-dimensional Hilbert space,it is preserved in a two-dimensional subspace such that the quantum dynamics in the subspace are similar to those in the PT-symmetry unbroken regime.In addition,we reveal that the competition between the inter-qubit coupling and the intra-qubit driving gives rise to a complex pattern in the EP variation with system parameters.
基金项目
山东省自然科学基金(ZR2021MA091)
山东省自然科学基金(ZR2018MA044)
Introduction and Cultivation Plan of Youth Innovation Talents for Universities of Shandong Province()
NETL
NSTL
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