FLEET-UNSW seminar Solid state qubits with industrial CMOS technology

Dr Roy Li, IMEC, Belgium

Live: UNSW School of Physics in G59/G60 Old Main Building

Zoom (coming)

Useful quantum computing applications require a physical qubit number beyond a million scale. Large qubit arrays need improvements in material quality and the fabrication process for good and uniform qubits, as well as layout optimization for an efficient analog control interface and qubit interconnect. Towards this end, we leverage the know-how of CMOS technology for scaling and integrate superconducting qubits and silicon spin qubits with advanced manufacturing technology.

The advanced process control in a 300 mm fab can result in an ultra-clean interface and uniform performance, providing new insight into material properties, controlling circuits, and up-scaling possibilities.

We will discuss the potential and constraints for qubit manufacturing with an industrial fab line and take a deep dive into the spin qubit platform. Through full gate stack optimization, we achieve ultra-low charge noise environments and develop a microscopic model for the noise mechanism as well as future optimization directions. In addition to qubit fabrication, we utilize CMOS device and circuit technologies to gain a deeper understanding of the qubit device and develop novel cryogenic control protocols.

Ruoyu Li is a senior researcher at imec, specializing in quantum computing with semiconductor spin qubits. His primary area of focus involves investigating the fundamental limitations of qubit coherence and strategies to enhance coherence, fidelity, and scalability using industrial fabrication techniques.

Prior to his current position, he was a postdoctoral research fellow at TU Delft, where he contributed to the Intel-QuTech collaboration. He developed a crossbar qubit array architecture to address wiring challenges and ensure compatibility with CMOS fabrication processes. Ruoyu received his Ph.D. in physics from the University of New South Wales in 2016, where he did pioneering research on holes and their spin-orbit interactions in pMOS quantum dots.