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Continuous-Variable Quantum Fourier Neural Operator for Solving Partial Differential Equations
Department of Civil and Environmental Engineering, Politecnico di Milano, 20133 Milan, Italy.ORCID iD: 0009-0004-3459-0704
Department of Civil and Environmental Engineering, Politecnico di Milano, 20133 Milan, Italy.ORCID iD: 0000-0001-5111-9800
Department of Civil and Environmental Engineering, Politecnico di Milano, 20133 Milan, Italy.ORCID iD: 0000-0001-9094-4731
KTH, School of Electrical Engineering and Computer Science (EECS), Computational Science and Technology.ORCID iD: 0000-0003-0639-0639
2026 (English)In: Entropy, E-ISSN 1099-4300, Vol. 28, no 7, article id 737Article in journal (Refereed) Published
Abstract [en]

Fourier Neural Operators have become a central tool for learning solution operators of partial differential equations, but their spectral layers remain entirely classical and rely on digital Fourier processing. In this work, we introduce the Continuous-Variable Quantum Fourier Neural Operator (CV-QFNO), a Gaussian photonic formulation of the FNO spectral layer. The proposed architecture maps the essential operations of Fourier-domain operator learning, Fourier transformation, mode selection, and channel mixing, onto native continuous-variable optical primitives. In this way, the CV-QFNO provides a photonic quantum analogue of the truncated spectral mechanism underlying the classical FNO, while avoiding the compilation overhead and spectral mismatch that arise in qubit-based Quantum FNO constructions. We extended the framework to both one- and two-dimensional operator learning and validated it on standard PDE benchmarks, including Burgers’ equation, heat equation, Navier–Stokes dynamics, and Darcy flow. The results show that the proposed model preserves the predictive accuracy, resolution generalisation, and spectral inductive bias of Fourier neural operators while using structurally constrained photonic parameterisation. Since all the experiments were performed as classical simulations, the contribution should be understood as an architectural and algorithmic blueprint for photonic neural operators rather than as a demonstration of quantum computational advantage.

Place, publisher, year, edition, pages
MDPI AG , 2026. Vol. 28, no 7, article id 737
Keywords [en]
Continuous-Variable Quantum Computing, Fourier neural operator, Photonic machine learning, neural operator, partial differential equations
National Category
Computational Mathematics Other Physics Topics Mathematical Analysis Fluid Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-386804DOI: 10.3390/e28070737ISI: 001831792100001PubMedID: 42511347Scopus ID: 2-s2.0-105045749857OAI: oai:DiVA.org:kth-386804DiVA, id: diva2:2091184
Note

QC 20260811

Available from: 2026-08-11 Created: 2026-08-11 Last updated: 2026-08-11Bibliographically approved

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Marcandelli, PaoloMariani, StefanoSiena, MartinaMarkidis, Stefano
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