Materials frontiers to empower quantum computing

Dr Giordano Scappucci

QuTech and Kavli Institute for Nanoscience, TU Delft

Giordano Scappucci is an expert in silicon germanium materials for quantum technologies. During his PhD (2004, University of Roma TRE, Italy), he made and studied state of the art high mobility Si/Ge heterostructures and nanowire transistors. Key achievements during his time at the University of New South Wales, Centre for Quantum Computing Technology, Australia include the development of atomic-scale donor-based device technology in silicon and germanium. At QuTech, TU Delft since 2015,Dr. Scappucci leads the materials effort in Si/Ge heterostructures for quantum computation and is a Principal Investigator in the QuTech/Intel partnership to accelerate quantum computing. Giordano Scappucci published over 50 journal articles, including publications in top tier journal as Nature and Science, and has given over 40 invited talks at international conferences, universities, research institutes and industry. 


The success in obtaining materials of sufficient purity underpinned our ability to manipulate semiconductors into electronic devices. The availability of such “electronic-grade” materialsare at the basis of the information age. To empower quantum computing, we need to extend our understanding of materials functionality from electronic grade to “quantum-grade”. We know the material science behind a good transistor: what are the requirement of materials that will enable qubitsfor the quantum information age of tomorrow?I will describe our research at QuTech into the Si/Ge material system to empower quantum computing. Si and Ge are compatible with advanced semiconductor manufacturing, are isotopically engineered to achieve long quantum coherence, and provide avenues for new quantum electronic devices when combined into SiGe heterostructures. As such, the Si/Ge material system is well positioned to bridge the gap between our electronic-grade and quantum-grade understanding of materials science as we are moving into the next phase of engineering qubit systems in the large numbers required for useful quantum computing.Our research on Si/Ge materials at QuTech has contributed to provide first answers to the following questions, ranging from technological to basic science: can we make industrial qubits? How do we connect qubits and scale up their number? Can we devise new materials and concepts for the next generation of quantum hardware?