首页|Exceptional points and quantum dynamics in a non-Hermitian two-qubit system
Exceptional points and quantum dynamics in a non-Hermitian two-qubit system
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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.
non-Hermitian systemexceptional pointPT-symmetry
张益玺、张振涛、杨震山、魏晓志、梁宝龙
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School of Physics Science and Information Technology,Shandong Key Laboratory of Optical Communication Science and Technology,Liaocheng University,Liaocheng 252059,China
山东省自然科学基金山东省自然科学基金Introduction and Cultivation Plan of Youth Innovation Talents for Universities of Shandong Province
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