Topological Diffractive Elements for Robust Quantum Entanglement

Revista, Zen, PHYSICS, 10

Published Nov 28, 2025• 0 citations

Abstract

The generation and manipulation of robust quantum entanglement are paramount for advancing quantum technologies, including quantum computing, communication, and sensing. Traditional methods often suffer from environmental decoherence and fabrication imperfections, limiting their scalability and fidelity. This paper explores the potential of topological diffractive elements (TDEs) to overcome these challenges by leveraging principles of topological protection. TDEs, drawing inspiration from topological photonics and metamaterials, exploit non-trivial topological properties to create wave propagation channels that are inherently robust against disorder and defects. We review the theoretical underpinnings of topological phases in optical systems, detailing how concepts such as Berry curvature and topological invariants can be harnessed in the design of diffractive structures. Specific attention is given to the generation of orbital angular momentum (OAM) entangled photons, where the topological charge plays a crucial role. We discuss various design methodologies for TDEs, including those based on photonic crystals, metasurfaces, and quasi-bound states in the continuum, and their application in creating stable and efficient sources of entangled photons. The paper highlights how the robustness afforded by topological protection can significantly enhance the fidelity and coherence lifetime of quantum entanglement, paving the way for more resilient quantum information processing systems. We also consider the experimental feasibility and potential applications of these advanced diffractive elements in integrated quantum circuits and remote entanglement distribution.

DOI: 10.5281/zenodo.17752456

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