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Host: Prof. Bo Gao
Venue: TDLI Meeting Room N102
Tencent Meeting link: https://meeting.tencent.com/dm/32b1GCrlTncP
Meeting ID: 885664582, no password
Abstract:
Superconducting Rapid Single Flux Quantum (RSFQ) integrated circuits (ICs) utilize superconducting wiring for signal transmission and Josephson junctions for fast switching. Leveraging quantized flux in superconducting loops, RSFQ circuits encode logic 0 and 1 based on the number of flux quanta per loop. This configuration boasts ultra-low power consumption and high operating speed, rendering RSFQ ICs highly promising for high-performance computing applications. However, a fully functional superconducting computer system has yet to be demonstrated despite numerous global efforts. This talk will first outline the collaborative optimization of fabrication, design, and measurement methodologies for developing reliable large-scale RSFQ ICs. Through process refinement paired with an updated Process Design Kit (PDK), a more accurate Josephson junction model, and concurrent development of advanced Electronic Design Automation (EDA) tools, the integration density of RSFQ logic chips has been substantially improved—boosting chip yield and design iteration efficiency. Building on these advances, the talk will then present the demonstration of an 8-bit RSFQ CPU, followed by that of a more complex 64-bit CPU. Additionally, to complete the superconducting computer system by interfacing with CMOS SRAM, different kinds of signal conversion interfaces has been developed to bridge SFQ signals (with sub-millivolt amplitudes) and CMOS signals (with amplitudes several orders of magnitude higher). Collectively, these efforts have enabled the successful demonstration of a superconducting computer system.
Biography:
Jie Ren holds a Bachelor’s degree in Physics from Nanjing University and a Ph.D. in Physics from Stony Brook University, SUNY. She is currently a professor at UCAS and Associate Director of the Superconducting Electronics Laboratory at SIMIT, CAS.
Her core research area is superconducting integrated circuit technology, with focus areas including high-fidelity PDK development, superconducting EDA tool design, superconducting ADCs, and ultra-low-power superconducting circuits. She has spearheaded major research initiatives, including the National Key R&D Program of China for Young Scientists, CAS Strategic Priority Research Program, and NSFC-funded projects. She is the recipient of honors such as the Young Top-Notch Talent (Ten-Thousand Talents Program), CAS Young Scientist Award, and National Women's Contribution Model award. With over 60 publications in journals like ACS Nano, IEEE TCAD, SUST and IEEE Micro, she also holds more than 40 invention patent applications.