Optical computing technology developer Quantum Source has raised a $12 million seed extension investment round led by Dell Technologies Capital with participation from 10D, as well as existing investors Eclipse VC, Grove Ventures, and Pitango First. The extension brings Quantum Source’s seed round total to $27 million. The additional financing will be used to expand the company’s research and development team as the company works to build fault-tolerant quantum systems that scale to millions of qubits.