Quantum Theory of Optical Coherence: Selected Papers and Lectures

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Roadmap on quantum light spectroscopy (2020, background): “In 1963 Roy J Glauber showed [4] that a classical current radiates a coherent state.”
Nonlinear optical signals and spectroscopy with quantum light (2016, methodology): “The initial state of the field is given by a direct product of coherent states: |t = −∞〉 = |β〉1|β〉2|β〉3, where |β〉α are eigenfunctions of the mode α annihilation operator: aα|β〉α = βα|β〉α. Coherent states are the most classical states of quantum light, hence we shall refer to them as classical optic”