EQuAL Seminar: Sunghoon Kim

Scalable nanoscale positioning highly coherent color centers for advanced quantum applications

Nanophotonic devices in color center-containing hosts provide efficient readout, control, and entanglement of the embedded emitters. Yet, precise control over color center formation – in number, position, and coherence – in nanophotonic devices remains a challenge to scalability. In this talk, I will present a novel method of controlled creation of color centers in prefabricated diamond nanostructures with three-dimensional nanoscale positioning precision. This approach leverages our lab's capability of chemical vapor deposition (CVD) diamond growth and a commercially available electron beam lithography (EBL) tool. This allows creating shallow color centers of long spin coherence aligned to nanopillars with 46 nm positioning precision, where their number per pillar can be easily tuned over a wide range. Next, in the realm of quantum sensing, I will show how our method can realize high-yield fabrication of sensitive magnetometers. Lastly, I will introduce several interesting applications by discussing ongoing collaborations utilizing either advanced quantum sensing or deterministically patterned spin defects for quantum simulation.