- 2024/02 - 現在 RIKEN Senior Visiting Researcher
- 2024/01 - 現在 National Institutes for Quantum and Radiological Science and Technology Institute for Quantum Life Science Visiting Researcher
- 2023/03 - 現在 Quantinuum K.K. Senior Scientific Advisor
- 2021/04 - 現在 Chubu University Center of Mathematics for Artificial Intelligence and Date Science (tentative), Academy of Emerging Science Professor
- 2020/12 - 現在 Chubu University Academy of Emerging Sciences Designated Professor
- 2018/04 - 2024/09 Nagoya University, Graduate School of Informatics Visiting Fellow
- 2019/09 - 2021/03 Chubu University, College of Engineering, Academy of Emerging Sciences, Professor
- 2017/04 - 2018/03 Toho University Faculty of Science Visiting Professor
- 2017/04 - 2018/03 Nagoya University Graduate School of Informatics Designated Professor
- 2016/04 - 2017/03 Nagoya University Graduate School of Information Science Designated Professor
- 2016/04 - Nagoya University Professor Emeritus
- 2008/04 - 2016/03 Graduate School of Information Science, Nagoya University Professor
- 2008/10 - 2014/03 National Institute of Informatics Visiting Professor
- 2009/04 - 2010/03 Tohoku University Visiting Professor
- 2001/10 - 2008/03 Graduate School of Information Science, Tohoku University Professor
- 2001/05 - 2001/09 Department of Electrical and Computer Science, Northwestern University Visiting Professor
- 1995/07 - 2001/09 School of Informatics and Science, Graduate School of Human Informatics, Nagoya University Professor
- 1998/06 - 1998/06 Pavia University Department of Physics Visiting Professor
- 1986/06 - 1995/06 Department of Mathematics, College of General Education, School of Informatics and Science, Nagoya University Associate Professor
- 1989/09 - 1990/03 Lyman Laboratory of Physics, Harvard University Visiting Scholar
- 1988/10 - 1989/08 Department of Electrical Engineering and Computer Science, Northwestern University Visiting Associate Professor
- 1985/03 - 1986/06 Department of Mathematics, College of General Education, Nagoya University Lecturer
- 1979/04 - 1985/02 Department of Information Science, Faculty of Science, Tokyo Institute of Technology Assistant Professor