Structured Single-photon Metasource

Jun-Yong Yan; Fang-Yuan Li; Zhou Zhou; Yue-Yao Mu; Hang-Yu Ge; Severin Kruger; Jianfeng Chen; Zhe Wang; Fulong Shi; Mengqi Liu; Haoye Qin; Ying Che; Yu-Tong Wang; Yunyan Zhang; Song Han; Zongyin Yang; Chaoyuan Jin; Huiyun Liu; Arne Ludwig; Feng Liu; Cheng-Wei Qiu

arXiv · 2603.23061

Structured Single-photon Metasource

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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.

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Jun-Yong Yan, Fang-Yuan Li, Zhou Zhou, Yue-Yao Mu, Hang-Yu Ge, Severin Kruger, Jianfeng Chen, Zhe Wang, Fulong Shi, Mengqi Liu, Haoye Qin, Ying Che, Yu-Tong Wang, Yunyan Zhang, Song Han, Zongyin Yang, Chaoyuan Jin, Huiyun Liu, Arne Ludwig, Feng Liu, Cheng-Wei Qiu. 2026-03-24. Structured Single-photon Metasource. https://arxiv.org/abs/2603.23061

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