Speaker's Brief Introduction： Zhirong Lin received his B.Sc. in Applied Physics from Xi'an Jiaotong University in 2006 and his Ph.D. in Physics from the University of Science and Technology of China (USTC) in 2011. From 2012 to 2018, he held positions as a Postdoctoral Researcher and later a Research Scientist in the team of Jaw-Shen Tsai (2012-2015) and Yasunobu Nakamura (2015-2018) at RIKEN, Japan, advancing his work in quantum computing and superconducting electronics. He joined the Shanghai Institute of Microsystem and Information Technology (SIMIT) of the Chinese Academy of Sciences as the Principal Investigator of the Superconducting Qubit Group in 2018 and was appointed Vice Director of the Superconducting Research Laboratory in 2024.
Abstract: Superconducting circuits have demonstrated significant potential as a platform for building large-scale quantum processors. However, scaling superconducting quantum circuits to thousands of qubits within a dilution refrigerator presents considerable challenges. One of the key obstacles is the reliance on classical microwave-based control, which necessitates substantial hardware overhead at room temperature for signal generation and transmission. In this presentation, we introduce a millikelvin control technique for superconducting qubits that leverages single flux quantum (SFQ) circuitry. By implementing this technique, we have achieved a single-qubit fidelity of 99.9%, offering a promising solution to the challenges of scalability. Additionally, I will also highlight our latest research progress in microwave quantum optics. We demonstrate the rapid generation of Schrödinger cat states using a Kerr-tunable SNAIL resonator and show how to precisely control microwave field with tunable collective quantum states in waveguide-coupled Bragg and anti-Bragg superatoms.