Photonic-cavity-enhanced laser writing of color centers in diamond

Color centers in wide bandgap materials such as diamond and silicon carbide are excellent candidates for quantum technologies due to their spin initialization, manipulation and readout. Landmark experiments have demonstrated exceptional properties of color centers across diverse applications, including sensing, entanglement, and metrology. An outstanding challenge has been precise localization and efficient device-coupling of these color centers. Here, we demonstrate an efficient laser-writing pathway to create co-localized color centers within nanophotonic devices in a diamond membrane. Utilizing a simple fabrication method to create devices ranging from nanometer to micron scale, our process points toward a scalable photonics platform with integrated color centers and vacancies.