Quantum photonic integration of silicon topological metasurfaces with NV centers in diamond

Interfacing single-photon sources with passive photonic structures is a key requirement in creating scalable photonic quantum networks and integrated circuits. In particular, the nitrogen-vacancy (NV) center in diamond has emerged as a promising candidate for a host of applications including but not limited to quantum information science. Another key component of on-chip quantum computing is the ability to manipulate light at the nanoscale using passive photonic structures. In this regard, topological metasurfaces have emerged as a potentially promising candidate for a robust and defect-tolerant platform that overcomes various losses associated with conventional waveguides. Here, we demonstrate a novel scheme for interfacing diamond NV centers with a silicon-based topological photonic metasurface. NV centers in nanodiamonds hosted on an atomic force microscope (AFM) tip are used to characterize the topological photonic structure and propagation properties are measured using a dual-galvo scanning confocal microscope. This scheme has the potential to provide a robust route towards integrated quantum photonics.