Recent progress on nonlinear properties of parity-time (PT)-symmetric systems is
comprehensively reviewed in this article. PT symmetry started out in non-Hermitian quantum …

This report on progress explores recent advances in our theoretical and experimental
understanding of the physics of open quantum systems (OQSs). The study of such systems …

Optical systems combining balanced loss and gain provide a unique platform to implement
classical analogues of quantum systems described by non-Hermitian parity–time (PT) …

By exploiting recent developments associated with coupled microcavities, we introduce the
concept of the PT-symmetric phonon laser with balanced gain and loss. This is …

Optomechanically-induced transparency (OMIT) and the associated slowing of light provide
the basis for storing photons in nanoscale devices. Here we study OMIT in parity-time (PT) …

We propose to realize mechanical parity-time (PT) symmetry in two coupled optomechanical
systems. To provide gain to one mechanical resonator and the same amount of dam** to …

Non-Hermitian systems with anti-parity-time (a PT) symmetry have revealed rich physics
beyond conventional systems. Here, we study optomechanics in an a PT-symmetric …

We theoretically study a strongly driven optomechanical system which consists of a passive
optical cavity and an active mechanical resonator. When the optomechanical coupling …

Coupled systems subject to dissipation exhibit two different regimes known as weak
coupling and strong coupling. Two damped coupled harmonic oscillators (CHOs) constitute …

Level repulsion—the opening of a gap between two degenerate modes due to coupling—is
ubiquitous anywhere from solid-state theory to quantum chemistry. In contrast, if one mode …