Exceptional points and quantum dynamics in a non-Hermitian two-qubit system

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 P T -symmetry unbroken, partially broken and fully...

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Veröffentlicht in:Chinese physics B 2024-05, Vol.33 (6), p.60308
Hauptverfasser: Zhang, Yi-Xi, Zhang, Zhen-Tao, Yang, Zhen-Shan, Wei, Xiao-Zhi, Liang, Bao-Long
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Sprache:eng
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Zusammenfassung: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 P T -symmetry unbroken, partially broken and fully broken regimes, each with distinct quantum-dynamics characteristics. Particularly, in the partially broken regime, while the P T -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 P T -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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/ad2a70