Development of scalable superconducting quantum processor in SKKU QFab

by Prof. Yonuk Chong (SungKyunKwan University (SKKU))

Thursday 15 Jan 2026, 14:30 → 16:30 Europe/Rome

U1-09 (University of Milano-Bicocca)

Abstract: Superconducting qubit has become one of the major platform in realizing practical, utility-scale quantum computing. The qubit consists of Josephson junctions integrated in passive microwave circuits. As the technology develops and commercialization is advancing, the quantum eco-system requires a robust supply chain in that each player focuses on their own strength to provide the best performance components for quantum machines. By leveraging the semiconductor infrastructure of Korea, we have established a quantum-dedicated Fab., or the QFab [1], in SKKU. QFab is a quantum foundry that provides superconducting qubit device fabrication to quantum researchers. In SKKU QFab, we have 3- to 6-inch complete process of superconducting devices in general. As an example of transmon qubits, we tape out every quarter. The fab typically targets around 1.5% standard deviation uniformity on chip. Recently we successfully delivered 20-qubit quantum processors to the Korea Research Institute of Standards and Science (KRISS), with which in order them to build a full-stack 20-qubit quantum computing system as a national flagship project. In coming years, we plan to extend the fab capability for up to hundreds of qubits and 8-inch capability, in collaboration with the Korean national nanofabrication facilities (KANC). In this presentation, I will present our fabrication results and QFab performances, with example of devices. I will also introduce our SKKU research laboratory research activities that covers various superconducting device research, including Qubit, SNSPD, TWPA and full-stack quantum computing system integration up to algorithm applications.

Yonuk Chong is Full Professor of the Department of Quantum Information Engineering at SKKU. His work focuses on the superconducting quantum devices in application to quantum computing, quantum sensing and fundamental science. He is the director of QFab and QCenter, Korean government’s two flagship initiatives for superconducting device foundry and quantum workforce education. His recent interest includes large-scale fabrication and integration of superconducting electronics, which requires a seamless combination of state-of-art nano- fabrication and high-frequency ultra-low temperature precision measurement.