Japan Quantum Computing Companies 2026: Complete Vendor Guide

Riken is the largest single national research institute in Japan and the academic anchor of the japan quantum computing companies ecosystem, with the Riken Center for Quantum Computing (RQC) coordinating superconducting hardware development, quantum-error-correction research, and quantum-HPC integration alongside Fujitsu, IBM, Quantinuum, and NVIDIA. The April 2025 256-qubit superconducting quantum computer with Fujitsu, the 2026 target for a 1,000-qubit superconducting system at the Fujitsu Technology Park, and the 2025 deployment of a 156-qubit IBM Heron processor at the Kobe facility (Japan’s first quantum-HPC integrated system) define the deepest commercial hardware footprint inside Japan. The collaboration also produced Japan’s first fully domestically produced quantum computer including dilution refrigerator, in partnership with QIQB and Fujitsu, and the broader NVIDIA allocation of 2,140 Blackwell GPUs to RQC for spring 2026 operations anchors the HPC-quantum integration roadmap. The Fujitsu partnership extends through March 2029 under Japan’s national quantum initiative.

Fujitsu is the deepest single corporate anchor of the japan quantum computing companies ecosystem, coordinating the RQC-Fujitsu Collaboration Center in Wako alongside Riken and producing the 256-qubit superconducting quantum computer launched April 2025 (a 4x upgrade from the previous 64-qubit system). The 2026 roadmap targets a 1,000-qubit superconducting system on the same Fujitsu-Riken platform with 10,000+ qubits planned by 2030. The Fujitsu Digital Annealer product line is the deepest commercial Japanese annealing-quantum technology, deployed with Toyota Systems in May 2025 to deliver 20x acceleration on automotive-connector-design workloads on standard computing hardware. The July 2025 University of Osaka quantum-computer launch added a second Fujitsu-supplied Japanese university deployment, complementing the Kobe Riken and Fujitsu Technology Park installations. Fujitsu also serves as the deepest Japanese corporate member of the broader Q-STAR industry alliance with 112 corporate members including Toyota, NEC, and Hitachi.

AIST is the second major Japanese national research lab inside the japan quantum computing companies ecosystem and the deepest single Quantinuum-hosting site outside the United States. AIST hosts a Quantinuum Helios system that produced the 37 operational logical qubits milestone documented in our cross-modality quantum logical-qubit leaderboard, the deepest trapped-ion logical-qubit deployment inside Japan. The broader AIST G-QuAT (Global Research and Development Center for Business by Quantum-AI Technology) coordinates the national quantum-application research programme alongside Riken on the academic side and Q-STAR on the corporate-industry side. AIST also hosts the broader Japanese MEXT and METI quantum-computing research programmes that anchor the national JPY 1.05 trillion quantum-investment strategy. The Tsukuba Science City location places AIST inside the deepest single concentration of Japanese national research institutes.

NEC is the third major Japanese corporate anchor in the japan quantum computing companies ecosystem, with a multi-modal quantum-computing programme that includes quantum annealing for optimisation, gate-based superconducting research, and a commercial ParityOS deployment in partnership with ParityQC. The 80-patent-family portfolio covers superconducting qubits, quantum annealing, and quantum-error correction, the deepest single Japanese corporate IP footprint in quantum computing. The application targets cover logistics optimisation, financial modelling, and traffic management across the broader Japanese telecoms-and-transport industry, with University of Tokyo on annealing algorithms (2020), the National Institute for Materials Science on quantum materials (2021), and Osaka University on gate-based quantum computing (2022) anchoring the research-partnership stack. NEC also serves the Amazon Web Services enterprise customer base as one of the first AWS Braket enterprise integrations on the Japanese side.

QunaSys is the deepest commercial Japanese quantum-chemistry-software pure-play in the japan quantum computing companies ecosystem, founded in Tokyo in 2018 to commercialise quantum-chemistry algorithms for pharmaceutical research, materials science, and drug discovery. The product portfolio centres on the QSCI (Quantum-Selected Configuration Interaction) Technical Portal and the broader quantum-enhanced molecular-simulation platform licensed to pharmaceutical companies for accelerated drug-discovery workloads. Total funding exceeds $29.7M+ across eight institutional backers including IBM Ventures, Mitsubishi Electric, Zeon Corporation, Global Brain, JIC Venture Growth, and Lightspeed Venture Partners. Commercial customers and partnerships include Biogen, Dow Chemical, Accenture, and the broader Japanese pharma-and-chemicals industry footprint. The 24-patent-family portfolio covers quantum-chemistry algorithms and variational-quantum-eigensolver technology, the deepest Japanese commercial quantum-software IP position.

Quantinuum Japan is the deepest non-Japanese-headquartered commercial vendor inside the japan quantum computing companies ecosystem, with the Mitsui & Co. $300M December 2023 strategic investment anchoring the Japanese cap-table position and the AIST Helios deployment producing the 37 operational logical qubits milestone in November 2025. The Tokyo office coordinates commercial deployment and customer success across Japanese enterprise customers, and the broader Quantinuum-Riken partnership extends through March 2029 as part of Japan’s national quantum-investment strategy. Quantinuum Japan is the deepest single trapped-ion vendor footprint in Japan, complementing the Riken-Fujitsu superconducting platform and the NEC-Fujitsu annealing programmes to give Japan multi-modal commercial-vendor coverage at scale. The architectural primitive that Quantinuum brings is the 99.99% two-qubit-fidelity Helios platform with the deepest published logical-qubit demonstration on trapped-ion hardware globally.

IBM Quantum operates two Japanese deployment sites that define the IBM footprint inside the japan quantum computing companies ecosystem. The original IBM Quantum System One deployment at the University of Tokyo (Hongo campus) became operational in 2023 as Japan’s first IBM Quantum System installation and serves the broader Japan-IBM Quantum Network of enterprise members. The 2025 deployment of a 156-qubit IBM Heron processor at the Riken Kobe facility created Japan’s first quantum-HPC integrated system, combining IBM Heron superconducting hardware with the broader Riken supercomputing infrastructure. The Japan-IBM Quantum Network includes Toshiba, Hitachi, JSR Corporation, Mizuho Financial Group, Mitsubishi Chemical, Mitsubishi UFJ Financial Group, Sony, and Yokogawa Electric as enterprise members, the deepest single-vendor enterprise quantum-computing footprint inside Japan after the Riken-Fujitsu state-coordinated programme.

NTT Research is the deepest Japanese corporate research lab in the japan quantum computing companies ecosystem with a substantial international footprint, running the Coherent Ising Machine (CIM) photonic-quantum platform alongside the broader NTT Basic Research Laboratories portfolio that anchors much of the foundational photonic-quantum-computing research in Japan. The CIM platform implements quantum-inspired optimisation through degenerate-optical-parametric-oscillator networks, the architectural primitive that differentiates NTT from the gate-model-quantum-computing programme at Riken and Fujitsu. The NTT IS Labs in Atsugi and the NTT Research Physics & Informatics Lab in Sunnyvale California coordinate the Japanese photonic-quantum-research foundation, and the broader NTT corporate footprint includes the NTT Communications quantum-secure-network deployment alongside Toshiba on the Japanese side and the global NTT data-centre infrastructure. NTT Research is a strategic partner of Q-STAR.

Toshiba operates the deepest Japanese commercial QKD programme in the japan quantum computing companies ecosystem, with the Toshiba Cambridge Research Laboratory (UK) anchoring the global research-and-development side and the Toshiba Energy Systems & Solutions Tokyo corporate footprint anchoring the Japanese commercial deployment. The Toshiba QKD platform competes globally with the ID Quantique commercial QKD portfolio (now an IonQ subsidiary since May 2025) and serves the broader Japanese banking-and-government quantum-secure-network procurement programme, the JPY-equivalent of the European EuroQCI and the South Korean SK Telecom + ID Quantique deployment. Toshiba also participates in the broader IBM Quantum Network Japan as an enterprise member, the deepest single Japanese-corporate engagement that combines QKD-hardware-supply with downstream gate-based-quantum-computing customer integration.

The Osaka University Center for Quantum Information and Quantum Biology (QIQB) is the third major academic anchor in the japan quantum computing companies ecosystem after Riken and AIST, hosting a Fujitsu-supplied superconducting quantum computer that launched in July 2025 as part of the broader Japanese national quantum-investment strategy. QIQB coordinates the gate-based-quantum-computing research programme at Osaka University and serves as a regional academic anchor distinct from the Tokyo-region Riken-Fujitsu-AIST cluster. The Osaka deployment is the second Fujitsu-supplied Japanese university quantum computer after the Riken Wako installation, and the broader Osaka academic-quantum ecosystem includes the Osaka University Faculty of Science, Engineering Science, and the broader regional research footprint. QIQB participates in the Q-STAR industry alliance and the broader JPY 1.05 trillion national quantum-investment programme designating 2025 as the first year of quantum industrialisation in Japan.

Yaqumo is a Kyoto-based quantum-hardware startup developing cold-atom quantum computers in partnership with research groups at Kyoto University and the Institute for Molecular Science. The company secured strategic backing from Quantonation in April 2026, its first Japanese investment, and signed a memorandum of understanding with Singapore-based Entropica Labs to integrate hardware and software for fault-tolerant systems under the witness of Singapore and Japan governments. Yaqumo’s neutral-atom approach uses individually addressable atoms held in optical tweezers as qubits, the same modality pursued at scale by QuEra and Atom Computing. The team plans staged hardware milestones culminating in scalable fault-tolerant operation, and has stated ambitions to operate as a vertically integrated Japanese hardware vendor.

blueqat is one of Japan’s longest-running quantum software companies, headquartered in Tokyo since its founding in 2008 by Yuichiro Minato. The firm publishes the open-source blueqat SDK for quantum-circuit programming, operates the blueqat Cloud platform for running jobs on third-party hardware backends, and runs a community of more than 8,000 Japanese developers through Quantum Computing Tokyo and the Quantum Software Project. blueqat has consulted with manufacturers, financial institutions, and government bodies on quantum-readiness and benchmark studies, and it partners with multiple hardware vendors to expose trapped-ion, superconducting, and annealing back-ends through a unified Python API. The company has been a constant in the Japanese ecosystem longer than nearly every other domestic quantum venture.

Hitachi runs one of Japan’s most established corporate quantum-research programmes through Hitachi Research and Development Group and Hitachi Cambridge Laboratory in the United Kingdom. The company has been developing silicon-based quantum-dot qubits since the early 2000s, leveraging its existing CMOS expertise to pursue scalable spin-qubit fabrication compatible with industrial semiconductor processes. Hitachi is a member of the Quantum Strategic Industry Alliance for Revolution (Q-STAR), participates in Japan’s national quantum hub at Riken, and delivers quantum-inspired optimisation services on its CMOS Annealing Machine that has been used for traffic-flow, logistics, and portfolio applications. The breadth of the parent organisation gives Hitachi uncommon ability to apply quantum techniques across rail, energy, healthcare, and manufacturing verticals.

Mitsubishi Electric is a long-standing player in Japan’s quantum-safe communications and cryptography programmes, with R&D running across its Information Technology R&D Center. The company has been an early adopter of post-quantum cryptography, contributing to NIST’s standardisation process, deploying lattice-based key-exchange schemes in its own products, and partnering with NICT on Tokyo QKD network field tests. Mitsubishi Electric also participates in Q-STAR alongside Toshiba, NEC, Fujitsu, and Hitachi, helping to set Japanese industry standards for quantum readiness across critical infrastructure. The firm’s product reach into power systems, defence, satellites, and factory automation positions it to integrate post-quantum security across operational technology, not just IT.

Quemix is a Japanese quantum software company specialising in materials and chemistry simulation, headquartered in Tokyo and spun out of work originating at TIS Inc., its parent company. The Quemix team has published variational quantum-algorithm work targeting drug discovery, catalyst design, and battery-materials simulation, and offers a proprietary platform combining classical density-functional theory with near-term quantum-circuit routines for hybrid workflows. The company partners with Japanese chemical and pharmaceutical companies on use-case proofs, and its researchers contribute to academic publications in collaboration with the University of Tokyo and Tohoku University. Quemix represents the growing class of small Japanese quantum-software ventures that are turning academic research into commercial chemistry workflows ahead of fault-tolerant hardware.

ULVAC is developing next-generation dilution refrigerators specifically for quantum computing in partnership with IBM, with deployment planned for 2026. The company installed its first system supporting Japan’s fully domestic quantum computer at Osaka University in April 2025, achieving stable 10 mK temperatures with modular architecture suitable for both research and scalable quantum systems. ULVAC’s partnership with IBM includes testing at IBM’s quantum data center in Poughkeepsie, New York, advancing the global supply chain for cryogenic quantum equipment.

LQUOM, formerly QWAVE Dynamics, is a Japanese quantum communication company founded in 2020 as a spin-out from Yokohama National University’s Horikiri Laboratory. It develops long-distance quantum communication technologies, including the quantum repeaters needed to realize the quantum internet. The company holds all the elemental technologies for quantum repeaters: quantum entanglement generators, quantum memory, wavelength conversion, and frequency stabilization.

In 2024, LQUOM commercialized the LQ-PS-100, a cavity-integrated two-photon entangled light source. In February 2025, it signed a joint research agreement with Quantinuum, Keio University, SoftBank, Mitsui & Co., Mitsubishi Electric, and Yokohama National University to work toward deployable and scalable quantum information processing.

The company was selected by NEDO for post-5G research and has raised $3.36M in Series B funding from SBI Investment, ORIX Capital, Bio Sight Capital, Anritsu, and SMBC Venture Capital.

QIDO Platform (Quantum-Integrated Discovery Orchestrator) is a partnership between Mitsui, Quantinuum, and QSimulate for drug and materials discovery targeting catalysts, enzymes, batteries, and reaction mechanisms. The collaborative platform integrates quantum computing into discovery workflows. QIDO represents a major industrial initiative to apply quantum computing to materials science and drug development challenges with commercial and scientific value.

Anritsu Corporation is a Japanese manufacturer of telecommunications test and measurement equipment, founded in 1895 and headquartered in Atsugi, Kanagawa.

Anritsu provides test equipment for quantum communication systems, including optical network analyzers, signal analyzers, and specialized instruments for validating quantum key distribution (QKD) networks and quantum communication infrastructure. It also develops testing solutions for quantum-safe telecommunications and post-quantum cryptography. The company serves telecommunications operators, quantum technology companies, research institutions, and quantum network developers, supplying the precision test and measurement capabilities that quantum networking deployments and quantum-safe telecommunications validation require.

SoftBank Group Corp. is a Japanese multinational conglomerate founded in 1981 and headquartered in Tokyo, Japan.

SoftBank invests in quantum technology companies through the SoftBank Vision Fund and its corporate ventures, including quantum computing startups and quantum technology providers. Its telecommunications division explores quantum-safe security for mobile networks and quantum communications technologies. By supporting quantum startup growth and quantum technology development, SoftBank contributes to both the Japanese and global quantum technology ecosystem, representing Japanese technology investment in the quantum computing sector worldwide.

QC Design is a Japanese quantum software company founded in 2021 that develops quantum circuit design tools and quantum algorithm development platforms. Its software covers quantum circuit optimization, quantum algorithm simulation, and quantum software development tools, with a focus on practical applications in chemistry, materials science, and optimization.

The company collaborates with Japanese quantum computing firms and research institutions to advance the country’s quantum software ecosystem. It serves quantum researchers, software developers, and enterprises exploring quantum applications, contributing to Japan’s quantum technology ecosystem and to wider quantum computing accessibility for scientific and industrial use.

Fixstars Amplify is a Tokyo-based company established in 2021 that offers a cloud platform built for combinatorial optimization problems, integrating quantum annealing, Ising machines, and gate-model quantum computers. The platform provides an SDK and execution environment for Ising machines, automating logical model conversion, physical model conversion, and machine execution to make quantum annealing programming more accessible. It is compatible with the company’s own Fixstars Amplify Annealing Engine (AE) as well as all available quantum annealing and Ising solvers, mathematical optimization solvers, and gate-based quantum computers. The GPU-based Amplify AE processes large-scale problems of more than 100,000 bits at high speed.

Since becoming publicly available in 2021, Amplify has processed more than 45 million user requests as of October 2024. It has been adopted in the Mitou Target Program since 2021, with positive feedback on SDK ease of use and performance. The platform also offers Toshiba’s Quantum-Inspired Optimization Solution SQBM+.

Qu-TES (Quantum Technology for Energy Security) focuses on quantum sensing technologies for energy applications, developing quantum sensors and measurement systems based on quantum technology. The Japanese company works on practical applications of quantum sensing for industrial and energy sector use cases, representing Japan’s growing quantum technology ecosystem beyond quantum computing to include quantum sensing and metrology applications.

Tokyo Quantum Computing develops integrated quantum hardware and software solutions combining superconducting quantum processors with quantum development tools and algorithms, focusing on advancing Japan’s quantum computing capabilities through full-stack quantum systems for research institutions and commercial applications in optimization and machine learning.

Kyoto University is a national research university founded in 1897 in Kyoto, Japan, and the country’s second oldest university. Its physics department and research institutes conduct quantum research spanning quantum physics, quantum materials, and quantum information science, with contributions to both theoretical and experimental quantum physics, quantum computing, and quantum technology development.

The university’s quantum research programs have produced Nobel Prize winners in physics. Kyoto University collaborates with Japanese quantum companies and international research institutions, and through fundamental research and education it advances the scientific foundations of quantum technology and supports Japan’s quantum research excellence.

Fuji Electric Co. Ltd. is a major Japanese electrical equipment manufacturer founded in 1923 that produces superconducting materials and components for quantum computing and power applications. The company manufactures superconducting wires, cables, and systems using both Low Temperature Superconductor (LTS) and High Temperature Superconductor (HTS) technologies.

Fuji Electric provides superconducting solutions for quantum computing infrastructure, including cryogenic systems, superconducting magnets, and power conditioning equipment used with quantum processors. Drawing on extensive experience in power electronics and cryogenic systems, the company supports quantum computing manufacturers that need reliable superconducting components. It serves quantum technology companies, research institutions, and cryogenic equipment manufacturers in Japan and globally, supplying superconducting materials for quantum processors, quantum communication systems, and quantum computing infrastructure.

Fujikura Ltd. is a major Japanese manufacturer founded in 1885 that produces superconducting wires, cables, and materials for quantum computing and telecommunications. The company manufactures high-temperature superconducting (HTS) wire and cable products, drawing on more than 135 years of cable and wire manufacturing expertise.

Fujikura’s superconducting solutions support quantum processors, superconducting qubits, quantum interconnects, and cryogenic quantum systems that need ultra-low-resistance electrical conductivity at cryogenic temperatures. The company serves quantum computing manufacturers, research institutions, telecommunications companies, and cryogenic equipment providers that rely on superconducting wire and cable for quantum computing infrastructure, quantum communication networks, and quantum sensing systems.

Groovenauts is a Japanese cloud and AI company partnering with the Institute for Molecular Science on cold atom quantum computer commercialization platform development. The company focuses on building cloud infrastructure and software platforms to make quantum computing accessible to enterprises and researchers. Groovenauts brings extensive cloud computing expertise to Japan’s quantum computing ecosystem, bridging the gap between quantum hardware and practical commercial applications.

Faraday Factory Japan is a Japanese manufacturer developing cost-effective mass production methods for High Temperature Superconducting (HTS) tapes, with production capacities approaching 100 thousand kilometers per year. The company produces second-generation HTS wire using advanced manufacturing processes that reduce costs and increase the availability of superconducting materials for quantum computing applications.

Faraday Factory Japan manufactures superconducting tape used in quantum computing infrastructure, including superconducting qubits, quantum interconnects, and cryogenic quantum systems. Its mass production capabilities support large-scale deployment of superconducting materials for quantum processors and other quantum technology applications.

The company serves quantum computing manufacturers, research institutions, cryogenic equipment providers, and quantum technology companies that need high-volume, cost-effective superconducting wire for quantum computing infrastructure, quantum communication systems, and quantum sensing applications.

Sigma-i is a Tokyo-based quantum computing startup founded in 2019 as a spinout from Tohoku University. It holds world-leading quantum annealing technologies and develops solutions that use quantum computers with annealing techniques.

The company partners with Toppan on quantum computing research focused on logistics optimization. In 2021, Sigma-i and Toppan began pilot tests that used quantum annealing to improve the efficiency of logistics operations from pickup through to receipt of goods, with the goal of launching logistics DX solutions in 2025. The two companies also research overall optimization solutions based on quantum annealing for sectors beyond logistics.

Sigma-i is part of Japan’s growing quantum startup ecosystem, which received major government backing in 2025 with roughly 130 billion yen ($855 million) for quantum research and technology development.

OptQC Corp. is a Japanese photonic quantum computing company building scalable, general-purpose optical quantum computers that operate at room temperature using time-domain multiplexing technology. The company draws on 25 years of optical quantum computing research at the University of Tokyo, and it runs HIQALI (Hub for Innovation in Quantum And Light-driven Industry), an innovation center focused on applying quantum and optical technology across optimization, AI, and machine learning.

In November 2025, OptQC signed a collaboration agreement with NTT Corporation to develop optical quantum computers targeting 10,000 qubits by 2027 and 1 million qubits by 2030. The partnership draws on Japan’s photonics and telecommunications expertise. The company’s experimental laboratory has been operational since May 2025, with its first commercial optical quantum computer scheduled for April 2026 and a 10,000 quantum mode processor targeted for 2028. Its technology emphasizes scalability, fast processing, energy efficiency, and compatibility with existing optical telecommunication infrastructure.

Quantum Biosystems is a Japanese research organization founded in 2013 that studies quantum effects in biological systems and develops applications in quantum biology. Its work investigates quantum phenomena in photosynthesis, enzyme catalysis, avian navigation, and neural processes.

The organization conducts research at the intersection of quantum physics and biology, exploring how quantum computing might be applied to biological modeling and drug discovery. It also publishes the research journal Quantum Biosystems to advance scientific understanding of quantum effects in living systems. Through this interdisciplinary work, Quantum Biosystems serves the scientific community studying quantum biology, quantum-enhanced biological modeling, and quantum computing in the life sciences, with potential applications in medicine, agriculture, and biotechnology.

NTT Data Corporation is a Japanese multinational information technology service and consulting company founded in 1967 and headquartered in Tokyo. Part of the NTT Group, it provides quantum computing services for enterprise clients, including quantum algorithm development, quantum consulting, and quantum software engineering.

NTT Data collaborates with quantum computing providers to offer quantum expertise and implementation services across industries, exploring applications for financial services, telecommunications, manufacturing, and the public sector. The company serves global enterprises that need quantum computing services and technology consulting, and it contributes to Japan’s quantum technology ecosystem by advancing quantum software development and supporting enterprise quantum transformation for business optimization and computational advantage.

Jij Inc. is a Japanese quantum computing company focused on quantum annealing. It develops the open-source software OpenJij for solving Ising Model and QUBO (Quadratic Unconstrained Binary Optimization) problems, and provides quantum annealing algorithms and tools that help enterprises apply quantum optimization to logistics, scheduling, and combinatorial optimization. The company connects academic quantum annealing research with practical industrial use in the Japanese market.

Through 2025, Jij continued to develop its quantum software platform and developer tools, with a focus on improving algorithm efficiency and expanding use cases. Engagement with the quantum developer community drives much of its product direction.

OpenJij is an open-source heuristic optimization library for the Ising model and QUBO, developed by Jij Inc., a Japanese startup. It is led by Chief Engineer and CTO Kohji Nishimura, a faculty member of the Nishimori lab at the Tokyo Institute of Technology, and its goal is a unified annealing platform.

The library provides a high-speed simulated annealing solver for QUBO and Ising models, with a Python interface that makes it easy to combine with other optimization tools. It supports both simulated annealing and simulated quantum annealing, which helps research into quantum computing technologies. OpenJij is fully open source under the Apache License Version 2.0, is actively maintained on GitHub, and continued to be used in advanced quantum computing research in 2024.

Jij Inc. brings together experts in mathematical optimization and quantum technology, serving the energy value chain and a wide range of industries worldwide.

Qubitcore is a Yokohama-based quantum computing startup, founded in July 2024 as a spinoff from the Okinawa Institute of Science and Technology (OIST). The company develops distributed quantum computing systems built on ion trap technology with photonic interconnects.

Led by CEO Ryuta Watanuki and CSO Prof. Takahashi, Qubitcore raised pre-seed funding in January 2025, and in April 2026 it raised a JPY 1.53 billion seed round led by SBI Investment, advancing Japan’s first trapped ion quantum computer initiative. Its roadmap calls for a testbed system by 2028, a 1,000-qubit prototype by 2029, and commercial deployment by 2030. The company’s R&D center sits at OIST in Okinawa, using the institute’s research facilities. Through 2025, Qubitcore continued developing its distributed ion trap architecture, marking Japan’s entry into trapped ion quantum computing.

Nanofiber Quantum Technologies (NanoQT) is Japan’s first startup focused on quantum computer hardware development. It uses a nanofiber-based Cavity QED (Quantum Electrodynamics) method to build universal quantum computers, drawing on more than a decade of engineering innovation to develop a proprietary nanofiber cavity. That cavity unlocks the advantage of cavity QED while staying compatible with optical fiber and existing quantum processing unit architectures.

The company’s interconnect technology is engineered for neutral-atom QPUs and offers a path beyond per-unit scalability limits. NanoQT announced the first closing of its $14 million Series A financing, led by Phoenix Venture Partners, following more than $20 million in government R&D grants across Japan and the United States.

Hamamatsu Photonics manufactures photonic devices and optical sensors for quantum technologies, including photomultiplier tubes (PMTs), single-photon avalanche diodes (SPADs), and qCMOS cameras for trapped ion and neutral atom quantum computing. Recent products include the ORCA-Quest 2 qCMOS camera with faster readout and enhanced UV sensitivity, plus their first commercial optically pumped magnetometer (OPM) for ultra-low magnetic field detection in quantum sensing. Hamamatsu acquired NKT Photonics in 2022 to strengthen its quantum photonics capabilities.

QuEL is an Osaka University-affiliated startup established in 2021 that supplies novel qubit controllers for quantum computing researchers. The company develops advanced control electronics and software for precise qubit manipulation in quantum computers. QuEL’s technology enables improved quantum gate fidelity and better overall quantum computer performance through sophisticated control systems.

ULVAC CRYOGENICS INC. is a Japanese company developing next-generation dilution refrigerators for quantum computers with input from IBM, strengthening Japan’s domestic supply of the cryogenic systems that quantum research and commercialization depend on. ULVAC runs evaluation tests in collaboration with IBM, including testing at IBM’s quantum data center in Poughkeepsie, New York, with industry deployment scheduled for early 2026.

The system maintains cryogenic temperatures at the 10mK level, uses a scalable modular design suited to future large-scale quantum environments, and relies on in-house manufacturing of core components including dilution refrigerators, pulse-tube cryocoolers, and vacuum components. In April 2025, ULVAC installed a dilution refrigerator at the University of Osaka Center for Quantum Information and Quantum Biology, supporting Japan’s first fully domestically built quantum computer. The company is establishing a domestic production framework to reduce dependence on overseas manufacturers.

Keio University Quantum Innovation Center is IBM’s first quantum innovation center in Asia, established in December 2023 to provide quantum computing resources and research collaboration opportunities. The center provides Japanese researchers and students with access to IBM quantum systems while fostering quantum education and workforce development. This partnership represents Japan’s strategy to accelerate quantum computing adoption and build domestic quantum expertise through collaboration with leading international quantum technology providers.

KDDI Corporation is a Japanese telecommunications operator founded in 1984 and headquartered in Tokyo. The company conducts quantum networking research, deploying quantum key distribution (QKD) networks and quantum-safe telecommunications infrastructure in Japan.

KDDI collaborates with quantum technology providers to advance practical quantum communications deployments, including quantum encryption for secure communications, and it explores quantum networking technologies for ultra-secure telecommunications and quantum internet infrastructure. The company serves Japanese telecommunications markets, enterprise customers, and government agencies that need quantum-safe communications and quantum network infrastructure, and it contributes to Japan’s National Quantum Technology Innovation Strategy by advancing quantum communications for the telecommunications industry.