Chiral Quantum Light Emitters in 2D Semiconductor/Magnet Heterostructures

Quantum light emitters (QEs)  are essential components for photonic quantum technology. The well-defined chirality of them is required to realize complex quantum networks. However, such chiral quantum light signature can only be established via applying a high external magnetic field or integrating with photonic or meta-cavities. Recent studies demonstrated the site-control 0D-confined QEs in monolayer transition-metal dichalcogenides (TMDCs) semiconductors through localized strain engineering make them ideal candidates for coupling with other structures. Here we present highly chiral single photons generated from QEs in monolayer TMDCs and van der Waal antiferromagnetic (AFM) insulator heterostructures at zero external magnetic field. These QEs are created by using a blunt scanning probe microscope to deform the heterostructures with near-unity spontaneous circular polarization and single-photon purity as high as 0.15. This deterministic approach enables the practical integration of solid-state highly chiral single photon QEs for future quantum information and communication application.