Structured Single-photon Metasource
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.
Cite
@article{arxiv.2603.23061,
title = {Structured Single-photon Metasource},
author = {Jun-Yong Yan and Fang-Yuan Li and Zhou Zhou and Yue-Yao Mu and Hang-Yu Ge and Severin Kruger and Jianfeng Chen and Zhe Wang and Fulong Shi and Mengqi Liu and Haoye Qin and Ying Che and Yu-Tong Wang and Yunyan Zhang and Song Han and Zongyin Yang and Chaoyuan Jin and Huiyun Liu and Arne Ludwig and Feng Liu and Cheng-Wei Qiu},
journal= {arXiv preprint arXiv:2603.23061},
year = {2026}
}
Comments
Manuscript with 8 pages and 4 figures plus Supplementary Materials comprising 11 pages and 9 figures