Parity–time symmetry and exceptional points in photonics

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Applications of bound states in the continuum in photonics (2023, background): “Photonic systems are popular platforms for exploring non-Hermitian systems, particularly the physics of exceptional points 209–211 .”
Quantum exceptional points of non-Hermitian Hamiltonians and Liouvillians: The effects of quantum jumps (2019, background): “For example, as summarized in very recent reviews [1,2], EPs are considered for novel enhanced sensing apparatuses and are relevant to describe dynamical phase transitions and in the characterization of topological phases of matter in open systems.”
Symmetry and Topology in Non-Hermitian Physics (2018, background): “[6] Ş.”
Nonseparable States of Light: From Quantum to Classical (2022, methodology): “For instance, the Schrödinger equation and related processing methods were also extended to study the classical light behavior in fibers [45, 46], nonlinear media [47, 48], complex waveguide systems [49, 50].”
Hybrid-Liouvillian formalism connecting exceptional points of non-Hermitian Hamiltonians and Liouvillians via postselection of quantum trajectories (2020, background): “Beyond the purely phenomenological interest in studying these systems, EPs are considered for novel apparatus harnessing peculiar properties of mode coalescence at an EP [10,11].”