Featured News
RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) is an international research center at RIKEN. It facilitates close collaborations among researchers from different disciplines in theoretical, mathematical and computational sciences. On April 1, 2025, iTHEMS transitioned from a program to a center. The ultimate goal of iTHEMS is to unravel the mystery of the Universe, matter, and life, as well as to solve key problems in modern society through interdisciplinary approaches.
Upcoming Events
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Workshop Tomorrow
iTHEMS-TheoryCenter(KEK) Scientific Writing and DEI Workshop
June 24 (Tue) - 25 (Wed), 2025
Ashleigh Griffin (Professor, Department of Biology, University of Oxford, UK)
Stuart West (Professor, Department of Biology, University of Oxford, UK)
Ryosuke Iritani (Senior Research Scientist, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS)) -
Seminar Tomorrow
ComSHeL introductions meeting
June 24 (Tue) at 14:00 - 15:30, 2025
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Seminar
Condensed-Matter Physics of Neutron Stars 1
June 25 (Wed) at 10:00 - 12:30, 2025
Hiroyuki Tajima (Assistant Professor, Graduate School of Science, The University of Tokyo)
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Seminar
Condensed-Matter Physics of Neutron Stars 2
June 25 (Wed) at 14:00 - 16:30, 2025
Daisuke Inotani (Postdoctoral Researcher, Research and Education Center for Natural Sciences, Keio University)
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Seminar
Generative Models for Statistical Field Theories
June 25 (Wed) at 15:00 - 16:00, 2025
Lingxiao Wang (Research Scientist, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
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Seminar
Simulating the spread of infection in networks with quantum computers
June 26 (Thu) at 13:00 - 14:00, 2025
Xiaoyang Wang (Postdoctoral Researcher, Quantum Mathematical Science Team, Division of Applied Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
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Seminar
Universal Pseudo-Goldstone Damping from the Real-Time Functional Renormalization Group
June 26 (Thu) at 15:00 - 16:00, 2025
Yang-Yang Tan (Ph.D. Candidate, Dalian University of Technology, China)
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Seminar
A diagrammatic approach to the Rasmussen invariant via tangles and cobordisms
June 26 (Thu) at 15:00 - 17:00, 2025
Taketo Sano (Research Scientist, Mathematical Application Research Team, Division of Applied Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
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Seminar
Exact WKB as unified analytic structure for resonance physics
June 27 (Fri) at 15:00 - 17:00, 2025
Okuto Morikawa (Special Postdoctoral Researcher, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
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Seminar
Quantum Computing Algorithms and Institute of Mathematics-for-Industry
July 3 (Thu) at 15:30 - 17:00, 2025
Hiroyuki Ochiai (Professor, Institute of Mathematics for Industry, Kyushu University)
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Seminar
iTHEMS Biology welcomes a new member!
July 3 (Thu) at 16:00 - 17:00, 2025
Aina Colomer i Vilaplana (Postdoctoral Researcher, Mathematical Genomics RIKEN ECL Research Unit, Division of Fundamental Mathematical Science, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS))
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Seminar
Boundary Scattering and Non-invertible Symmetries in 1+1 Dimensions
July 4 (Fri) at 14:00 - 15:00, 2025
Soichiro Shimamori (Ph.D. Student, Osaka University)
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Colloquium
The 29th MACS Colloquium
July 4 (Fri) at 14:45 - 18:00, 2025
Takashi Sakajo (Professor, Division of Mathematics and Mathematical Sciences, Graduate School of Science, Kyoto University)
Shinichi Sasa (Professor, Division of Physics and Astronomy, Graduate School of Science, Kyoto University) -
Seminar
Computational Problems in Post-Quantum Cryptography
July 7 (Mon) at 15:30 - 17:00, 2025
Tsuyoshi Takagi (Professor, Department of Mathematical Informatics, The University of Tokyo)
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Conference
RIKEN Theory Symposium
July 9 (Wed) - 10 (Thu), 2025
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External Event
What is “Quantum”!?: RIKEN Symposium Commemorating 100 Years of Quantum Science
July 12 (Sat) at 13:00 - 17:00, 2025
Makoto Kobayashi (Director Emeritus, Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University)
Yasunori Nomura (Professor, Berkeley Center for Theoretical Physics, University of California, Berkeley, USA)
Kenji Ito (Professor, Division of Contemporary Culture, Graduate School of Letters, Kyoto University)
Miho Hatanaka (Professor, Department of Chemistry, Faculty of Science and Technology, Keio University)
Norio Kawakami (Deputy Director, Fundamental Quantum Science Program, TRIP Headquarters, RIKEN)
Yasushi Okada (Deputy Director, RIKEN Center for Biosystems Dynamics Research (BDR))
Kouichi Hagino (Professor, Graduate School of Science, Kyoto University)
Shigeki Takeuchi (Professor, Graduate School of Engineering, Kyoto University)
Yasunobu Nakamura (Director, RIKEN Center for Quantum Computing (RQC))
Makoto Gonokami (President, RIKEN) -
Seminar
Mesoscopic transport via one-dimensional chain with Localized two-body loss
July 23 (Wed) at 10:00 - 11:30, 2025
Kensuke Kakimoto (Ph.D. Student, Faculty of Science and Engineering, School of Fundamental Science and Engineering, Waseda University)
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Workshop
The Theory of Periodic Tangles & Their Interdisciplinary Applications
July 28 (Mon) - August 1 (Fri), 2025
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Workshop
Recent Developments and Challenges in Tensor Networks: Algorithms, Applications to science, and Rigorous theories
July 28 (Mon) - August 8 (Fri), 2025
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Colloquium
Chemical and isotopic analyses of samples returned by the Hayabusa2 mission from the asteroid Ryugu
August 1 (Fri) at 14:00 - 15:30, 2025
Tetsuya Yokoyama (Professor, Department of Earth and Planetary Sciences, School of Science, Institute of Science Tokyo)
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Workshop
iTHEMS Cosmology Forum #4 - Evolving Cosmos: new physical insights from new spectroscopic data
August 4 (Mon) - 5 (Tue), 2025
Seshadri Nadathur (Associate Professor, University of Portsmouth, UK)
Andrei Cuceu (NASA Einstein Fellow, Lawrence Berkeley National Laboratory (LBNL), USA)
Gerrit Farren (Postdoc, Lawrence Berkeley National Laboratory (LBNL), USA)
Antonio De Felice (Associate Professor, Yukawa Institute for Theoretical Physics, Kyoto University)
Linda Blot (Project Assistant Professor, Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo)
Wen Yin (Associate Professor, Department of Physics, Graduate School of Science, Tokyo Metropolitan University) -
Workshop
iTHEMS-NCTS Workshop
August 18 (Mon) - 21 (Thu), 2025
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Conference
XIIIth International Symposium on Nuclear Symmetry Energy (NuSym25)
September 8 (Mon) - 13 (Sat), 2025
Opportunities
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Seeking a few Postdoctoral Researchers (25-695)
Deadline: Open until filled
Postdoctoral Researcher a few positions. iTHEMS is seeking Postdoctoral Researchers to join the Mathematical Genomics RIKEN ECL Research Unit, where we aim to advance research that uncovers the evolution and diversity of life through genomic data.
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Seeking a Postdoctoral Researcher (25-509)
Deadline: July 4, 2025
Postdoctoral Researcher: 1 position. iTHEMS is seeking a Postdoctoral Researcher in the field of theoretical physics or mathematical sciences to collaborate on the JST BOOST project “Construction of Random Network Representations of Quantum Spacetime and Gravitational Learning Models”, led by Research Scientist Sotaro Sugishita, the principal investigator of the project.
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[Female only] Seeking a few Senior Research Scientists, Research Scientists, Postdoctoral Researchers, or Research Associates (25-508)
Deadline: Open until filled
iTHEMS is seeking female candidates for a few positions as Senior Research Scientist, Research Scientist, Postdoctoral Researcher, or Research Associate.
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Seeking a few Research Scientists or Postdoctoral Researchers (W25015)
Deadline: Open until filled
iTHEMS is seeking Research Scientists or Postdoctoral Researchers to join the Mathematical Social Science Team and advance mathematical research aimed at deepening our understanding of collective social phenomena and contributing to the realization of a stable and sustainable society.
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Seeking a Team Director (W25020)
Deadline: July 11, 2025
Team Director: 1position. iTHEMS is seeking a Team Director to lead the 'AI for Science' initiative, which aims to accelerate research in the natural and social sciences through cutting-edge AI and mathematical science, in collaboration with researchers inside and outside iTHEMS.
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Seeking Postdoctoral Researcher, Research Scientist or Senior Research Scientist (W24328)
Deadline: Open until filled
Postdoctoral Researcher, Research Scientist or Senior Research Scientist, about 6 positions. iTHEMS is seeking researchers to join RIKEN Quantum, a cross-disciplinary initiative leveraging quantum computers and simulators to drive innovation across physics, chemistry, life sciences, humanities, computational science, and information science.
Latest News
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2025-06-23
Press ReleaseBulk-Edge Correspondence of Measurement-Induced Topological Phases
A research group including Ryusuke Hamazaki (Senior Research Scientist, iTHEMS) has proposed a method to investigate the effective energy level structures and bulk topological invariants in quantum systems under measurement. Utilizing this approach, the team conducted a theoretical analysis of topological phase transitions induced by quantum measurements. Their findings revealed that zero-energy edge states originating from so-called "Majorana particles" can emerge in topological phases under continuous measurement. Furthermore, the study demonstrated that the bulk-edge correspondence, a universal principle typically known to hold in isolated quantum systems, also manifests in measurement-driven quantum systems. This work establishes a robust theoretical foundation for measurement-induced topological phase transitions. The method developed is broadly applicable to a wide class of topological phases, offering a versatile tool that may lead to a systematic and unified understanding of quantum phases induced by measurement. For more details, please refer to the related links.
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2025-06-23
Press ReleaseSuccess in Quantum Chemistry Calculations through Quantum–Supercomputer Collaboration
An international research team, including Senior Research Scientist Tomonori Shirakawa, has demonstrated the practical potential of quantum computing by performing calculations that combine IBM's quantum computer with RIKEN's supercomputer "Fugaku" to address quantum chemistry problems that have been difficult to analyze using conventional classical computers. In this study, by processing output data obtained from a real quantum computer with a supercomputer, the team successfully obtained scientifically meaningful results for a large-scale quantum chemical system exceeding 50 qubits for the first time. This achievement demonstrates that quantum computing is effective even for quantum chemistry problems that surpass the limitations of classical computation, marking a significant step forward toward the practical application of quantum computing. For more details, please refer to the related links.
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2025-06-23
Research NewsRIKEN NEWS: A New World Unlocked by a Data Geek
An interview with Catherine Beauchemin (Deputy Director, iTHEMS) has been featured in the RIKEN People section, as part of the Close-up RIKEN 2025 series on RIKEN’s research introduction page. With her quick wit, rapid-fire speech, and warm smile, she embodies the charm and potential of what it means to be human. Dr. Beauchemin is pioneering a new research field known as “virus physics.” By applying the tools of physics, she investigates viruses, unseen entities that can pose serious threats to our lives. To read the full story, please see the related link below.
Upcoming Visitors
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Visiting
Stuart West
Professor, Department of Biology, University of Oxford, UKTerm: April 10 (Thu) - July 7 (Mon), 2025Visiting Place: RIKEN Wako Campus -
Visiting
Ashleigh Griffin
Professor, Department of Biology, University of Oxford, UKTerm: April 10 (Thu) - July 7 (Mon), 2025Visiting Place: RIKEN Wako Campus -
Chang Po-Yao
Assistant Professor, Department of Physics, National Tsing Hua University, TaiwanTerm: June 30 (Mon) - August 24 (Sun), 2025Visiting Place: Main Research Building -
Nancy Bird
Research Fellow, University College London, UKTerm: July 27 (Sun) - August 1 (Fri), 2025Visiting Place: Main Research Building -
Alba Nieto Heredia
Ph.D. Student, L'Institut de Systématique, Évolution, Biodiversité, FranceTerm: July 28 (Mon) - August 9 (Sat), 2025Visiting Place: RIKEN Wako Campus