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 |
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Format: | Artikel |
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. |
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ISSN: | 1674-1056 2058-3834 |
DOI: | 10.1088/1674-1056/ad2a70 |