A review is given on the foundations and applications of non-Hermitian classical and
quantum physics. First, key theorems and central concepts in non-Hermitian linear algebra …

Exceptional points are spectral singularities in open quantum and wave systems that exhibit
a strong spectral response to perturbations. This feature can be exploited for a new …

Non-Hermitian optics is a burgeoning field at the intersection of quantum physics,
electrodynamics, and nanophotonics. It provides a new perspective of the role of gain and …

Nearly one century after the birth of quantum mechanics, parity–time symmetry is
revolutionizing and extending quantum theories to include a unique family of non-Hermitian …

Sensing an incoming signal is typically associated with absorbing a portion of its energy,
inherently perturbing the measurement and creating reflections and shadows. Here, in …

We introduce here the concept of acoustic parity-time (PT) symmetry and demonstrate the
extraordinary scattering characteristics of the acoustic PT medium. On the basis of exact …

Recent advances in gradient metasurfaces have shown that by locally controlling the
bianisotropic response of the cells one can ensure full control of refraction, that is, arbitrarily …

Harnessing parity–time symmetry with balanced gain and loss profiles has created a variety
of opportunities in electronics from wireless energy transfer to telemetry sensing and …

Parity-time (PT) symmetric systems experience phase transition between PT exact and
broken phases at exceptional point. These PT phase transitions contribute significantly to …

The concept of non-Hermitian physics has inspired numerous intriguing phenomena in
classical wave systems. By introducing judicious arrangements of gain and loss media, non …