In recent years, notions drawn from non-Hermitian physics and parity–time (PT) symmetry
have attracted considerable attention. In particular, the realization that the interplay between …

Canonical quantum mechanics postulates Hermitian Hamiltonians to ensure real
eigenvalues. Counterintuitively, a non-Hermitian Hamiltonian, satisfying combined parity …

Materials and their geometry make up the tools for designing nanophotonic devices. In the
past, the real part of the refractive index of materials has remained the focus for designing …

The interplay between the nonclassical features and the parity-time (PT) symmetry (or its
breaking) is studied here by considering a PT-symmetric system consisting of two cavities …

Exceptional points (EPs) are the singular branch points of the non-Hermitian Hamiltonian
spectrum. They lead to many exotic phenomena of non-Hermitian systems. However, it is …

We present the results of linear stability of a damped coplanar double pendulum and its
nonlinear motion, when the point of suspension is vibrated sinusoidally in the vertical …

The gain-driven emission in gain–loss coupling systems attains significant interest. In this
work, we study the monochromatic oscillation of a gain–loss coupling system through a …

We report an unusual buildup of the quantum coherence in a qubit subjected to non-
Hermitian evolution generated by a Parity-Time ($\mathcal {PT} $) symmetric Hamiltonian …

A PT-symmetric, non-Hermitian Hamiltonian in the PT-unbroken regime can lead to unitary
dynamics under the appropriate choice of the Hilbert space. The Hilbert space is determined …

We treat a PT-symmetric directional coupler with Kerr nonlinearity in both the single-mode
waveguides. We investigate the quantum propagation of a coherent state through this …