Integrated Reconfigurable Photon-Pair Source Based on High-Q Nonlinear Chalcogenide Glass Microring Resonators

Chalcogenideglasses (ChGs) have recently emerged as enabling materialsfor building reconfigurable nanophotonic devices by employing theirrefractive index changes associated with photosensitive effects. Inparticular, the availability of low-loss thin-film ChGs and the realizationof high-Q microresonators provide exciting opportunities for integratedphotonics. So far, the ChG photonic devices are predominately operatedin the classical optics regime. In this work, we present the realizationon-chip bright photon-pair quantum light sources via spontaneous four-wavemixing in a high-Q microring resonator fabricated on the newly developedChG Ge25Sb10S65 platform. The emissionwavelength of the photon-pair source can be continuously tuned acrossa double-free spectral range in a reconfigurable manner. Our workserves as a starting point to fully unleash the potential of exploitingChGs for developing reconfigurable integrated quantum photonic devices.