Japan is the quantum power the rest of the field keeps forgetting to name. It invented the superconducting qubit on which IBM, Google and most of the industry now build, and it formalised the quantum annealing that others later commercialised, yet by announced sovereign investment it sits second to China and has not yet managed to convert that inheritance into commercial position as quickly as some of its rivals. The reason lies in where the effort went. Japan chose a research and long-horizon engineering  approach, a patient bet on getting each step towards fault tolerance right rather than fast. That patience costs market share but buys credibility, a balance now being tested as the hardware arrives and the strategy hardens into fixed targets.

A Founding Role, And An Uncomfortable Middle Chapter

Japan was present at nearly every founding moment in quantum science, from the physics itself to the first working devices. Nishina Yoshio, who worked in Niels Bohr’s Copenhagen circle in the 1920s, brought the new quantum mechanics home and established a leading school of modern physics at RIKEN. His intellectual lineage produced two Nobel laureates: Hideki Yukuwa in 1949 and Sin-Itiro Tomonaga for quantum electrodynamics in 1965. Japan later produced another foundational quantum device through Leo Esaki, whose tunnel diode showed quantum tunnelling in a solid-state device, in 1973 and earned him a share of the 1973 Nobel prize.

The decisive moment for superconducting quantum computing came in 1999, when Yasunobu Nakamura, Yuri Pashkin, and Jaw-Shen Tsai at NEC’s Tsukuba laboratories, demonstrated coherent control of a qubit in a single-Cooper-pair box. That device was the first experimentally-demonstrated superconducting qubit and direct ancestor of transmon qubits later adopted by the likes of IBM, Google, and others. In 2003, an expanded NEC team also demonstrated an early conditional operation between two coupled superconducting charge qubits. Japan owns a second foundational idea as well, since in 1998 Tadashi Kadowaki and Hidetoshi Nishimori at the Tokyo Institute of Technology formalised the modern quantum annealing using a transverse-field Ising system, the intellectual basis D-Wave would later commercialise in Canada. Then came the uncomfortable middle chapter, as the country that invented both watched commercial momentum migrate to the United States through the 2000s and 2010s.

Second Only To China, By Announced Investment

The reversal became unmistakable in early 2025, when Japan unveiled a package of 1.05 trillion yen (roughly $7.4 billion) and named the year the “First Year of Quantum Industrialisation”. That commitment, about three-quarters of all public quantum funding announced worldwide in the first half of 2025, places the country second in national announced quantum investments up to 2025, behind China’s more than $15 billion, according to McKinsey, and ahead of the United States. The headline may flatter the reality, though, because the figure is a combined chips-and-quantum envelope the trade ministry has cast primarily as an AI and semiconductor budget. The quantum-specific slice may be a smaller slice of the total pie, though the figures have not been publicly isolated. Japan nevertheless added more targeted support during 2025, including a reported ¥50 billion (~$335 million USD) programme for more than ten established companies and startups, followed by approximately ¥130 billion (~$885 million) for quantum research in a later supplementary budget 

Patent filings place Japan more modestly still. Between 2000 and 2024, the United States and China each took roughly 28% of quantum patent applications, while Japan sits third at around 11%. The filings understate it, because patent volume measures how often a country files rather than how well it builds, and more than 80% of Japan’s cluster in computing, leaving single-digit shares in communications and sensing, where its science is arguably equally as strong. Strong examples include Toshiba sending the first quantum key over 100 kilometres of fibre in 2003 and now sells quantum-secure networking with Orange in France, the first commercial quantum-network service in France. 

The Architecture Of A Patient Strategy

Japan’s quantum push reads less as scattered grants than as one interlocking architecture, built deliberately over five years. The Cabinet Office set the direction with its 2020 Quantum Technology and Innovation Strategy, widened it into the 2022 Vision of Quantum Future Society, which established the principal 2030 targets of 10 million quantum tech users in Japan, a ¥50 trillion (~$309 billion USD) economic production, and homegrown quantum unicorn companies.    These ambitions were translated into an industrial action plan through the 2023 Strategy of Quantum Future Industry Development. Beneath it sit several complementary delivery vehicles, each dovetailing with the others. MEXT’s Q-LEAP programme funds work across quantum computing, sensing and next-generation lasers, while the JST-coordinated Moonshot Goal 6 reaches further out, aiming to demonstrate at a fault-tolerant machine by 2050 by way of an error-corrected device by 2030. RIKEN’s Center for Quantum Computing heads the innovation hubs, with Japanese partners, and released Japan’s first domestically produced quantum computer in 2023. From an hybrid perspective, the AIST-hosted G-QuAT runs testbeds that stitch quantum and classical systems together, while its wider facilities support component testing, fabrication, and industrial use case development.

The clearest proof that the scaffolding is now bearing hardware begins with Japan’s partnership with IBM, signed with the University of Tokyo in 2019 and expanded through the Quantum Innovation Initiative Consortium in 2020. This collaboration put the country’s first gate-based quantum computer in Kawasaki in 2021, only the third IBM Quantum System One installation worldwide. A separate IBM partnership with RIKEN then pushed the architecture towards quantum centric supercomputing. RIKEN switched on the first IBM Quantum System Two outside the United States in June 2025, a 156-qubit system co-located in Kobe with the Fugaku supercomputer and linked to it at the instruction level. More recently, Japanese state-backed JIC Venture Growth Investments (JIC VGI) and Toyota Invention Partners (TIP) became new institutional shareholders in Yaqumo’s, a neutral atom platform, seed extension round, reinforcing Japan’s intent to accelerate the lab to commercialisation transition for their most promising quantum startups. The intent is less to bet on a single qubit technology than to weave several, domestic and imported, into one classical-quantum platform while the winning approach remains unknown.

A Hardware Nation With A Thinner Software Layer

Japan’s is a government-and-conglomerate model, strong on manufacturing depth and weaker on agility, with its weight overwhelmingly on hardware. The Fujitsu-RIKEN superconducting roadmap runs from 64 qubits in 2023 to 256 in April 2025. Fujitsu has since extended that trajectory into a planned 10,000 physical qubits by 2030 on Fujitsu’s early-fault-tolerant STAR architecture, while Hitachi pursues silicon spin qubits, NTT a photonic Coherent Ising Machine and Toshiba commercialised quantum key distribution. Japan’s most defensible position may not be a computer at all but the components others need, with Hamamatsu Photonics a major global supplier of photonic parts and national strength running deep in lasers, cryogenics and precision materials.

The software layer, by contrast, is strikingly thin, with roughly 20+ active quantum computing startups and around $100 million in disclosed funding as of 2026, a far smaller venture base than the United States or the likes of the UK commands. That said, Japan’s most visible early stage names are nonetheless software ones, among them QunaSys in quantum chemistry, Jij in optimisation and Quanmatic in machine learning, but any claim that Japan is deliberately positioning itself as a software node may be half-true at most. The claim would describe the startup layer rather than the country, and sits beside a national programme whose money flows overwhelmingly to hardware.

All of this frames the real question rather than settling it. Japan has the science, the manufacturing base and now the capital. The central issue is whether a system built for patience and precision can turn quiet excellence into market position before faster-moving rivals scale first. The country that built the first superconducting qubit in 1999 knows better than most how far invention sits from industry. In quantum, as in much else, the prize will not go not to whoever files or funds the most, but to whoever finishes what they start.