Structured Single-photon Metasource

TL;DR

This paper introduces a semiconductor metasource that directly integrates quantum dots with a nonlocal GaAs metasurface, enabling efficient, deterministic generation of structured single-photon patterns like OAM beams and holograms, advancing quantum light control.

Contribution

It demonstrates a novel integrated quantum light source using a nonlocal metasurface with quantum dots, achieving high efficiency and versatile wavefront shaping for quantum information applications.

Findings

Efficient funneling of quantum dot emission into a quasi-BIC mode.

Generation of diverse single-photon patterns including OAM and holography.

Scalable approach for integrated structured quantum light sources.

Abstract

Structured quantum light is crucial for high-dimensional quantum information processing, yet its direct generation from quantum emitters remains challenging due to their intrinsic locality and omnidirectional radiation. Metasurfaces have been adopted for quantum-light wavefront shaping, typically in cascaded or stacked configurations that suffer from low efficiency and limited resolution. Here, we demonstrate a semiconductor metasource that directly embodies single quantum dots in a nonlocal GaAs metasurface. Spontaneous emission from quantum dot is efficiently funneled into an extended quasi-bound-state-in-the-continuum mode while sustaining strong mode-emitter overlap. A lateral core-barrier heterostructure tunes mode volume and spatial distribution to balance Purcell enhancement and holographic resolution. Using spatially modulated geometric phase, our compact metasource enables deterministic generation of diverse single-photon radiation patterns, including orbital-angular-momentum beams and holographic images. Our work brings versatile single-photon wavefront control into the nanoscale cavity quantum electrodynamics regime, offering a scalable route toward integrated sources of structured quantum light.