Europe and Japan have great synergies<\/a> when it comes to high-performance computing,\u201d said Boillod-Cerneux. \u201cToday, the Americans are dominating certain fields, such as AI. Europe and Japan want to build their own ecosystem together, to offer an alternative.\u201d<\/p>\nThis connects\u00a0to a broader European push to strengthen technological sovereignty in supercomputing and AI. Through the European High-Performance Computing Joint Undertaking, the EU and participating countries are investing billions of euros in a new generation of supercomputers and AI infrastructure across Europe.<\/p>\n
A recent milestone in that effort was the launch of\u00a0the JUPITER supercomputer at Forschungszentrum J\u00fclich in Germany \u2013 also a HANAMI partner. JUPITER is the first European supercomputer to achieve exascale performance \u2013 performing more than one quintillion calculations per second.<\/p>\n
Systems operating at this scale are expected to accelerate research in\u00a0diverse fields, from climate science to AI and advanced manufacturing.<\/p>\n
Ongoing cooperation<\/p>\n
Supercomputers are used for scientific simulations too complex for conventional computers. During the COVID-19 pandemic, for example, they helped researchers model the virus and test huge numbers of potential drug compounds. They are also used to simulate the Earth\u2019s climate, predict extreme weather events and study new materials.<\/p>\n
\u201cJapan and Europe are very similar when it comes to high-performance computing research,\u201d said Kengo Nakajima, deputy director of the RIKEN Center for Computational Science in\u00a0Kobe, and a professor at the University of Tokyo.<\/p>\n
\u201cBoth have long traditions in climate research and supercomputing. We can learn a lot from each other thanks to our long-standing cooperation.\u201d<\/p>\n
The HANAMI collaboration also comes as Europe and Japan deepen scientific ties more broadly. In late 2025, the European Commission and Japan concluded negotiations on Japan\u2019s association to Horizon Europe, opening the way for even closer cooperation in research and innovation.<\/p>\n
Building trust in simulations<\/p>\n
Climate modelling is one of the\u00a0main\u00a0areas of cooperation. Researchers hope increasingly sophisticated simulations will help scientists and policymakers better understand the future impacts of climate change.<\/p>\n
But for supercomputers to be useful, scientists need to trust the results they produce.<\/p>\n
\u201cWe\u2019re looking at the reproducibility of the results,\u201d Boillod-Cerneux explained. \u201cWe need to make sure that the results stay consistent, even when they are generated on different supercomputers.\u201d<\/p>\n
Unlike ordinary computers, supercomputers are highly specialised systems that often use different hardware and software architectures. Ensuring that scientific results remain accurate and comparable across different machines is therefore a\u00a0significant\u00a0challenge.<\/p>\n
\u201cThe hardware might be impressive, but a lot of our work is about software,\u201d said Boillod-Cerneux. \u201cIt\u2019s about optimising scientific applications so they can run efficiently on these highly complex systems.\u201d<\/p>\n
Researchers involved in HANAMI are sharing expertise and testing methods across European and Japanese platforms to improve the reliability and transparency of scientific simulations.<\/p>\n
As systems become larger and more complex, ensuring that results remain reproducible and trustworthy across different computing platforms becomes ever more critical.<\/p>\n
The collaboration is also exploring medical applications. One research team, for example, has been modelling airflow and fluid movement inside the human nose. These simulations could help surgeons better prepare for nose and sinus procedures and potentially reduce complications for patients.<\/p>\n
Supercomputing in the age of AI<\/p>\n
The growing importance of AI is reshaping\u00a0the world of supercomputing. AI systems rely heavily on supercomputers for training and processing the enormous amounts of data needed to operate.<\/p>\n
\u201cAI has made what we do much more tangible for the public,\u201d said Boillod-Cerneux. \u201cPeople increasingly use AI in everyday life, and supercomputers provide much of the computing power behind it.\u201d<\/p>\n
AI is also beginning to transform scientific research itself. Researchers increasingly use\u00a0AI\u00a0to analyse huge datasets, identify hidden patterns and accelerate simulations that would previously have taken far longer to complete.<\/p>\n
This emerging field \u2013\u00a0often called\u00a0AI for Science \u2013 is becoming a growing strategic priority in Europe. In October 2025, the European Commission presented its European Strategy for Artificial Intelligence in Science, aimed at helping researchers responsibly integrate\u00a0AI\u00a0into scientific work.<\/p>\n
At the same time, the rapid growth of AI has intensified global competition over access to advanced computing chips and infrastructure. This is essential not only for AI systems, but also for next-generation scientific simulations.<\/p>\n
For researchers\u00a0in\u00a0HANAMI, cooperation between Europe and Japan is partly about strengthening long-term scientific and technological resilience.<\/p>\n
\u201cThe rapid growth of AI is reshaping the market for high-performance computing chips,\u201d said Boillod-Cerneux. \u201cI\u2019m confident that Europe and Japan can develop their own chip and software ecosystem. Europe has the talent and expertise to remain independent, but it will take time. Partnerships with countries like Japan are key.\u201d<\/p>\n
Nakajima believes the next stage of cooperation could focus increasingly on AI-driven scientific discovery.<\/p>\n
\u201cI think the next step of our cooperation with Europe should focus more on AI-for-science,\u201d he said. \u201cWe need to merge our expertise so we can push each other forward.\u201d<\/p>\n
This article was originally published\u202fin\u00a0Horizon<\/a>\u00a0the EU Research and Innovation Magazine.<\/p>\nResearch in this article was funded by the EU\u2019s Horizon Programme. <\/p>\n","protected":false},"excerpt":{"rendered":"From predicting climate change to developing new medicines, supercomputers underpin modern science. Europe and Japan are now working…\n","protected":false},"author":2,"featured_media":41627,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[2121,15231,30036,30037,8,31],"class_list":["post-41626","post","type-post","status-publish","format-standard","has-post-thumbnail","category-japan","tag-artificial-intelligence","tag-computer-science","tag-high-performance-computing","tag-horizon-europe","tag-japan","tag-nippon"],"_links":{"self":[{"href":"https:\/\/www.europesays.com\/japan\/wp-json\/wp\/v2\/posts\/41626","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/japan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/japan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/japan\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/japan\/wp-json\/wp\/v2\/comments?post=41626"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/japan\/wp-json\/wp\/v2\/posts\/41626\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/japan\/wp-json\/wp\/v2\/media\/41627"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/japan\/wp-json\/wp\/v2\/media?parent=41626"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/japan\/wp-json\/wp\/v2\/categories?post=41626"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/japan\/wp-json\/wp\/v2\/tags?post=41626"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}