2023/11/06 by Chris Gustin, Gustin, Chris, Ryotatsu Yanagimoto +7 · 2 citations
Computer Science · Engineering · Mathematics · #Broadband #Computer science #Degrees of freedom (physics and chemistry) #Dissipative system #FOS: Physical sciences #Harmonic #Mathematics #Neural Networks and Reservoir Computing #Nonlinear system #Optical Network Technologies #Optics #Optics (physics.optics) #Photonic and Optical Devices #Photonics #Physics #Quadratic equation #Quantum #Quantum Physics (quant-ph) #Quantum mechanics #Statistical physics
paper · pdf · doi:10.48550/arxiv.2311.03597
published in arXiv (Cornell University) (Cornell University)
openalex publication_date 2023/11/06 · openalex created_date 2023/11/09 · openalex updated_date 2026/07/28
In broadband quantum optical systems, nonlinear interactions among a large number of frequency components induce complex dynamics that may defy heuristic analysis. In this work we introduce a perturbative framework for factoring out reservoir degrees of freedom and establishing a concise effective model (effective field theory) for the remaining system. Our approach combines approximate diagonalization of judiciously partitioned subsystems with master equation techniques. We consider cascaded optical χ(2) (quadratic) nonlinearities as an example and show that the dynamics can be construed (to leading order) as self-phase modulations of dressed fundamental modes plus cross-phase modulations of dressed fundamental and second-harmonic modes. We then formally eliminate the second-harmonic degrees of freedom and identify emergent features of the fundamental wave dynamics, such as two-photon loss channels, and examine conditions for accuracy of the reduced model in dispersive and dissipative parameter regimes. Our results highlight the utility of system-reservoir methods for deriving accurate, intuitive reduced models for complex dynamics in broadband nonlinear quantum photonics.