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Effects of extreme nonlinear optics, such as high harmonic generation (HHG), are conventionally modeled with classical electromagnetic fields: both the driving and emitted fields are treated classically. We present the fully quantum electrodynamical theory of extreme nonlinear optics and use it to predict new quantum effects in HHG. The quantum description shows new effects in both the spectral and statistical properties of HHG. We also describe how the HHG process changes in the single-atom regime and discuss experiments that can test our various predictions. Revealing the quantum-optical nature of HHG could lead to novel sources of attosecond light having intrinsically quantum statistics, such as squeezing and entanglement.
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Alexey Gorlach, Ofer Neufeld, Nicholas H. Rivera, Oren Cohen, Ido Kaminer, "Implications of quantum optics in high harmonic generation," Proc. SPIE 11461, Active Photonic Platforms XII, 1146120 (22 August 2020); https://doi.org/10.1117/12.2569059