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Dynamics of Quantum States Distinguishability in PT and APT Qubits
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DOI：10.1007/s10773-026-06314-4.png)
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Abstract
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We investigate the distinguishability of qubits governed by PT- and APT-symmetric Hamiltonians in both unbroken and broken phases. Analytical expressions for the time-dependent distinguishability are derived, showing that in the unbroken phase, both systems exhibit periodic oscillations. The oscillation period decreases with increasing Hermitian parameters or with decreasing non-Hermitian contributions, and the distinguishability reaches unity at integer multiples of this period. This work extends earlier studies on PT-symmetric qubits by exploring more general PT-symmetric Hamiltonians and by incorporating APT-symmetric qubits into the analysis.
Keywords:
Qubit
Parity-time symmetry (PT)
Anti-parity-time symmetry (APT)
Distinguishability
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1.7
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199
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