An introduction to PT-symmetric quantum mechanics-time-dependent systems

A Fring - Journal of Physics: Conference Series, 2023 - iopscience.iop.org
I will provide a pedagogical introduction to non-Hermitian quantum systems that are PT-
symmetric, that is they are left invariant under a simultaneous parity transformation (P) and …

Anti--symmetric qubit: Decoherence and entanglement entropy

J Cen, A Saxena - Physical Review A, 2022 - APS
We investigate the dynamics of a general two-level based anti-parity-time (anti-PT)-
symmetric qubit and study its decoherence as well as entanglement entropy properties. We …

Real energies and Berry phases in all PT-regimes in time-dependent non-Hermitian theories

A Fring, T Taira, R Tenney - Journal of Physics A: Mathematical …, 2023 - iopscience.iop.org
We demonstrate that the existence of a Hermitian time-dependent intertwining operator that
maps the non-Hermitian time-dependent energy operator to its Hermitian conjugate and its …

Unitarity of the time-evolution and observability of non-Hermitian Hamiltonians for time-dependent Dyson maps

FS Luiz, MA de Ponte, MHY Moussa - Physica Scripta, 2020 - iopscience.iop.org
We present an strategy for the derivation of a time-dependent Dyson map which ensures
simultaneously the unitarity of the time evolution and the observability of the whole time …

Quasi-Hermitian formulation of quantum mechanics using two conjugate Schroedinger equations

M Znojil - Axioms, 2023 - mdpi.com
To the existing list of alternative formulations of quantum mechanics, a new version of the
non-Hermitian interaction picture is added. What is new is that, in contrast to the more …

Exotic entanglement for non-Hermitian Jaynes–Cummings Hamiltonians

T Frith - Journal of Physics A: Mathematical and Theoretical, 2020 - iopscience.iop.org
We provide the first solution of a time-dependent metric operator for the non-Hermitian
Jaynes–Cummings Hamiltonian. We use this solution to calculate the entanglement …

[HTML][HTML] Spectrally equivalent time-dependent double wells and unstable anharmonic oscillators

A Fring, R Tenney - Physics Letters A, 2020 - Elsevier
We construct a time-dependent double well potential as an exact spectral equivalent to the
explicitly time-dependent negative quartic oscillator with a time-dependent mass term …

Unitary evolution for a two-level quantum system in fractional-time scenario

D Cius, L Menon Jr, MAF Dos Santos, ASM de Castro… - Physical Review E, 2022 - APS
The time-evolution operator obtained from the fractional-time Schrödinger equation (FTSE)
is said to be nonunitary since it does not preserve the norm of the vector state in time. As …

Enhancement of photon creation through the pseudo-Hermitian Dynamical Casimir Effect

D Cius, FM Andrade, ASM de Castro… - Physica A: Statistical …, 2022 - Elsevier
We analyse here the pseudo-Hermitian Dynamical Casimir Effect, proposing a non-
Hermitian version of the effective Law's Hamiltonian used to describe the phenomenon. We …

Time-dependent metric for the two-dimensional, non-Hermitian coupled oscillator

A Fring, T Frith - Modern Physics Letters A, 2020 - World Scientific
We provide a time-dependent Dyson map and metric for the two-dimensional harmonic
oscillator with a non-Hermitian ixy coupling term. This particular time-independent model …