Yasunari Suzuki

Team Director, Quantum Computer System Design Research Team

Outline

To solve practical problems with quantum computers faster than conventional ones, we need to identify scalability issues in quantum computing and solve them with various engineering approaches. Our laboratory aims to design faster and more scalable quantum computers by exploring their systems and software, as modern computer engineering succeeds in achieving complex and scalable functionality in our society. Through this approach, we will establish modern quantum computer systems and software engineering in the field of quantum computation.

Research Theme

・Operating systems for controlling various types of integrated qubits
・Computer architecture for fault-tolerant quantum computing
・System software for large-scale fault-tolerant quantum computers

Representative Research Results

・Qulacs: a fast quantum circuit simulator (URL: https://github.com/qulacs/qulacs/, paper: Yasunari Suzuki, Yoshiaki Kawase, Yuya Masumura, Yuria Hiraga, Masahiro Nakadai, Jiabao Chen, Ken M. Nakanishi, Kosuke Mitarai, Ryosuke Imai, Shiro Tamiya, Takahiro Yamamoto, Tennin Yan, Toru Kawakubo, Yuya O. Nakagawa, Yohei Ibe, Youyuan Zhang, Hirotsugu Yamashita, Hikaru Yoshimura, Akihiro Hayashi, Keisuke Fujii, “Qulacs: a fast and versatile quantum circuit simulator for research purpose”, Quantum 5, 559 (2021))

・Qubit control systems and automated calibration in quantum computer cloud service “叡” (press: https://www.riken.jp/pr/news/2023/20230324_1/)

・Development of FTQC compilers and simulators, and benchmark and optimization for applications based on them (press: https://www.t.u-tokyo.ac.jp/press/pr2024-05-14-001 paper: Nobuyuki Yoshioka*, Tsuyoshi Okubo*, Yasunari Suzuki*, Yuki Koizumi, Wataru Mizukami*, "Hunting for quantum-classical crossover in condensed matter problems“, npj Quantum Information 4, 45 (2024))

・Burst-error-tolerant FTQC architecture (press: https://group.ntt/jp/newsrelease/2022/09/30/220930a.html paper: Yasunari Suzuki, Takanori Sugiyama, Tomochika Arai, Wang Liao, Koji Inoue, Teruo Tanimoto, "Q3DE: A fault-tolerant quantum computer architecture for multi-bit burst errors by cosmic rays", the 55th IEEE/ACM International Symposium on Microarchitecture (MICRO), pp. 1110-1125 (2022))

・Load-store architecture for FTQC (press: https://group.ntt/jp/newsrelease/2025/03/04/250304a.html paper: Takumi Kobori*, Yasunari Suzuki*, Yosuke Ueno, Teruo Tanimoto, Synge Todo, Yuuki Tokunaga, “LSQCA: Resource-Efficient Load/Store Architecture for Limited-Scale Fault-Tolerant Quantum Computing”, The 31st IEEE International Symposium on High-Performance Computer Architecture(HPCA2025), accepted (2025))