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Laser beams --- Atoms --- Multiphoton processes --- Photoionization --- Faisceaux laser --- Atomes --- Processus à plusieurs photons --- Photo-ionisation --- Congresses. --- Congrès --- Processus à plusieurs photons --- Congrès --- Laser beams - Congresses. --- Atoms - Congresses. --- Multiphoton processes - Congresses. --- Photoionization - Congresses.

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Experimental atomic and molecular physics --- fysicochemie --- Photochemistry --- Multiphoton processes --- Congresses --- Congresses. --- Processus à plusieurs photons --- Processus à plusieurs photons. --- Processus à plusieurs photons.

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Prototypical quantum optics models, such as the Jaynes–Cummings, Rabi, Tavis–Cummings, and Dicke models, are commonly analyzed with diverse techniques, including analytical exact solutions, mean-field theory, exact diagonalization, and so on. Analysis of these systems strongly depends on their symmetries, ranging, e.g., from a U(1) group in the Jaynes–Cummings model to a Z2 symmetry in the full-fledged quantum Rabi model. In recent years, novel regimes of light–matter interactions, namely, the ultrastrong and deep-strong coupling regimes, have been attracting an increasing amount of interest. The quantum Rabi and Dicke models in these exotic regimes present new features, such as collapses and revivals of the population, bounces of photon-number wave packets, as well as the breakdown of the rotating-wave approximation. Symmetries also play an important role in these regimes and will additionally change depending on whether the few- or many-qubit systems considered have associated inhomogeneous or equal couplings to the bosonic mode. Moreover, there is a growing interest in proposing and carrying out quantum simulations of these models in quantum platforms such as trapped ions, superconducting circuits, and quantum photonics. In this Special Issue Reprint, we have gathered a series of articles related to symmetry in quantum optics models, including the quantum Rabi model and its symmetries, Floquet topological quantum states in optically driven semiconductors, the spin–boson model as a simulator of non-Markovian multiphoton Jaynes–Cummings models, parity-assisted generation of nonclassical states of light in circuit quantum electrodynamics, and quasiprobability distribution functions from fractional Fourier transforms.

microwave photons --- n/a --- circuit quantum electrodynamics --- fractional Fourier transform --- spin-boson model --- reconstruction of the wave function --- multiphoton processes --- quantum entanglement --- topological excitations --- Floquet --- light–matter interaction --- semiconductors --- quasiprobability distribution functions --- dynamical mean field theory --- global spectrum --- superconducting circuits --- Jaynes-Cummings model --- quantum Rabi model --- quantum simulation --- non-equilibrium --- stark-effect --- integrable systems --- light-matter interaction

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In view of the rapid growth in both experimental and theoretical studies of multiphoton processes and multiphoton spectroscopy of atoms, ions and molecules in chemistry, physics, biology, material sciences, etc., it is desirable to publish an Advanced Series that contains review papers readable not only by active researchers in these areas, but also by those who are not experts in the field but who intend to enter the field. The present series attempts to serve this purpose. Each review article is written in a self-contained manner by the experts in the area so that the readers can grasp the

Multiphoton processes. --- Spectrum analysis. --- Laser spectroscopy. --- Molecular spectra. --- Molecules --- Spectrum, Molecular --- Absorption spectra --- Mass spectrometry --- Molecular spectroscopy --- Nuclear spectroscopy --- Raman spectroscopy --- Spectrum analysis --- Analysis, Spectrum --- Spectra --- Spectrochemical analysis --- Spectrochemistry --- Spectrometry --- Spectroscopy --- Chemistry, Analytic --- Interferometry --- Optics --- Radiation --- Wave-motion, Theory of --- Light --- Spectroscope --- Multiple photon processes --- Processes, Multiphoton --- Excited state chemistry --- Lasers in chemistry --- Photochemistry --- Quantum electrodynamics --- Quantum optics --- Qualitative --- Analytical chemistry

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This volume presents the recent progress and perspective in multi-photon processes and spectroscopy of atoms, ions, molecules and solids. The subjects in the series cover the experimental and theoretical investigations in the interdisciplinary research fields of natural science including chemistry, physics, bioscience and material science. Contents: Theoretical Foundations for Exploring Quantum Optimal Control of Molecules (Tak-San Ho, Herschel Rabitz and Shih-I Chu); Intramolecular Nuclear Flux Densities (I Barth, C Daniel, E Gindensperger, J Manz, J F Pérez-Torres, A Schild, C Stemmle, D Sul

Multiphoton processes --- Spectrum analysis --- Laser spectroscopy --- Analysis, Spectrum --- Spectra --- Spectrochemical analysis --- Spectrochemistry --- Spectrometry --- Spectroscopy --- Chemistry, Analytic --- Interferometry --- Optics --- Radiation --- Wave-motion, Theory of --- Absorption spectra --- Light --- Spectroscope --- Multiple photon processes --- Processes, Multiphoton --- Excited state chemistry --- Lasers in chemistry --- Photochemistry --- Quantum electrodynamics --- Quantum optics --- Research. --- Data processing. --- Diagnostic use. --- Qualitative --- Analytical chemistry