Chongfan Technology
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24
2026
-
07
High-Performance Multidimensional Engineered Quantum Light Source Based on a Monolithic Microcavity–Metasurface Interface
Author:
The teams of Jin Liu and Xuehua Wang at Sun Yat-sen University, Liu Liu at Zhejiang University, and Yijie Shen at Nanyang Technological University in Singapore have proposed a monolithic microcavity–metalens interface. This interface comprises a quantum-dot–micropillar single-photon source and an ultrathin metalens, precisely aligned on either side of a III–V compound semiconductor chip. The pronounced cavity quantum electrodynamics effects generated by the micropillar cavities enhance the quantum-dot–mediated single-photon emission, while achieving high purity, high brightness, and high photon indistinguishability. Meanwhile, the multifunctional metalens enables simultaneous control over multiple physical degrees of freedom of the emitted light, including radiation divergence, emission directionality, polarization state, and orbital angular momentum (OAM). Furthermore, the authors successfully generated, within this integrated device, high-fidelity polarization–OAM entanglement as well as single photons exhibiting localized spin‑topological structures. They demonstrate the stable propagation of single-photon skyrmions through atmospheric turbulence, revealing their topological advantages over conventional structured quantum light. Their work advances research at the intersection of integrated quantum photonics and metasurface optics, providing an integrated, high‑dimensional quantum light source for cutting‑edge photonic quantum science and technology.
The research findings were published in eLight on April 23, 2026, under the title “High-performance sources of multidimensionally engineered quantum light based on monolithic microcavity-metalens interfaces.”
Figure 1: Working principle of the monolithic microcavity–metalens interface.
Figure 2: Fabrication process of the monolithic microcavity–metalens interface
Figure 3: Characterization of the metalens-based collimated single-photon source.
Figure 4: Manipulation of the photon state of the emitted single photon.
Figure 5: Generation of polarization–orbital angular momentum entanglement based on the microcolumn–metalens interface.
Figure 6: Generation of topologically stable single-photon skyrmions based on a microcolumn–metasurface interface.
Source: Optics World
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