Includes contributions from leading researchers in parity-time symmetry and non-Hermitian physics.

Includes bibliographical references and index.

Linear and nonlinear experiments in PT-symmetric photonic mesh lattices -- PT-symmetry on-a-chip: harnessing optical loss for novel integrated photonic functionality -- Parity-time symmetry in scattering problems -- Scattering theory and PT-symmetry -- Passive PT-symmetry in laser-written optical waveguide structures -- Non-Hermitian effects due to asymmetric backscattering of light in whispering-gallery microcavities -- Exact results for a special PT-symmetric optical potential -- Parity-time-symmetric optical lattices in atomic configurations -- Effects of exceptional points in PT-symmetric waveguides -- Higher order exceptional points in discrete photonics platforms -- Non-Hermitian optical waveguide couplers -- Parity-time symmetric plasmonics -- PT-symmetry and non-Hermitian wave transport in microwaves and RF circuits -- Coupled nonlinear Schrödinger equations with gain and loss: making the PT symmetry unbreakable -- Krein signature in Hamiltonian and PT-symmetric systems -- Integrable nonlocal PT symmetric and reverse space-time nonlinear Schrödinger equations -- Construction of non-PT-symmetric complex potentials with all-real spectra -- Constant-intensity waves in non-Hermitian media -- Nonlinear beam propagation in a class of complex non-PT-symmetric potentials.

The book Parity-Time Symmetry and Its Applications is an advanced reference on the theory and applications of PT symmetry in quantum mechanics and photonics. Edited by leading researchers, it covers the mathematical foundations of non-Hermitian physics, exceptional points, optical waveguides, lasers, and emerging technologies. Combining theoretical developments with experimental research, the book serves as a comprehensive resource for graduate students, physicists, engineers, and researchers working in quantum physics, optics, and related interdisciplinary fields.