Towards quantum frequency conversion of single photons from ⁸⁸Sr⁺ ions from the visible to near infrared for hybrid quantum networks

Quantum frequency conversion is a technique that allows for the efficient conversion of a photon from one wavelength to another while preserving quantum information. One area of interest is the development of a long-distance quantum network that leverages the advantages of different matter-based platforms, which first require quantum frequency conversion as an intermediate step. We show progress made towards the development of quantum frequency conversion, using difference frequency generation, for the conversion of single photons from ⁸⁸Sr⁺ ions from the visible to near infrared. We target the wavelength of an emitted photon from a SiC divacancy center, with the future aim of demonstrating an entanglement scheme involving the two platforms.