Entanglement and squeezing of the optical field modes in high harmonic generation
Philipp Stammer, Javier Rivera-Dean, Andrew S. Maxwell, Theocharis Lamprou, Javier Argüello-Luengo, Paraskevas Tzallas, Marcelo F. Ciappina, Maciej Lewenstein, arXiv:2310.15030 (2023) https://arxiv.org/abs/2310.15030