2026-10-13T05:14:29Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34033659 2026-10-02T16:00:24Z category_37476 portal_1023 item_type_12 month_year_10_2026

Nonlinear Quantum Optics in Epsilon-Near-Zero Nanospheres: a Macroscopic Quantum Electrodynamics Approach Sonia Alipour (24566424) Marco Ornigotti (3960899) Physics (arXiv) physics.optics (arXiv) We present a theoretical framework for handling quantum nonlinear processes in epsilon-near-zero (ENZ_ nano spheres, based on macroscopic quantum electrodynamics and the resonant states (RSs) expansion of the Green's tensor in nano cavities. Using third-harmonic generation (THG) as a case study, we derive analytical expressions for the generation efficiency, and the quantum fluctuations of the generated nonlinear field, as a function of different quantum states of the impinging pump field. Finally, we discuss how to generalise this theoretical framework to arbitrarily quantum nonlinear processes in photonic nanostructures. 2026-09-30T00:00:00Z Text Preprint 10.48550/arXiv.2609.35146 https://figshare.com/articles/preprint/Nonlinear_Quantum_Optics_in_Epsilon-Nesar-Zero_Nanospheres_a_Macroscopic_Quantum_Electrodynamics_Approach/34033659 CC0