Metasurface-mediated quantum entanglement via bound states in the continuum

2025/05/21 by Riley, Hannah, Lassalle, Emmanuel, Abujetas, Diego Romero +3
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.2505.15751

Abstract

Scalable quantum technologies demand entanglement between many distant quantum emitters (QEs), for which we propose using high-Q, spatially extended bound states in the continuum (BICs) in all-dielectric metasurfaces. We show that QE-BIC coupling efficiencies (β-factors) can exceed 80%, comparable to waveguides even without further mode engineering, but within a 2D geometry that naturally accommodates large QE arrays and relaxes strict emitter placement. Inter-QE entanglement is generated faster than in free space, is significantly amplified, and persists over several resonant wavelengths. Optimality requires large β-factors but moderately small Purcell factors. Our results establish all-dielectric metasurfaces as a practical, scalable platform for leading-edge quantum photonics.

Citations

• Recent Advances in Metasurface Design and Quantum Optics Applications with Machine Learning, Physics-Informed Neural Networks, and Topology Optimization Methods
• Strong coupling between surface plasmon polaritons and emitters: a review
• QED in dispersing and absorbing media
• Entanglement of Formation of an Arbitrary State of Two Qubits

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