Quantinuum filed an 8-K on November 11, 2026, disclosing an expanded partnership with RIKEN and a collaboration with SoftBank Corp. centered on the successful upgrade of the Reimei quantum computer at RIKEN to Quantinuum's H2 system model.

Key Highlights

  • Reimei upgraded to H2: Quantinuum's Reimei quantum computer, installed at RIKEN, completed its upgrade to the H2 system model, according to the filing.
  • Expanded RIKEN partnership: The two organizations signed a memorandum of understanding to expand joint research, covering electronics, energy, and life sciences applications.
  • Fault-tolerant "Made with Japan" quantum computer: Quantinuum and RIKEN will work with Japanese universities and domestic component suppliers to develop a fault-tolerant quantum computer under a "Made with Japan" initiative.
  • SoftBank collaboration: Under a separate agreement, Quantinuum, RIKEN, and SoftBank Corp. will explore directly connecting quantum computers to AI data centers in Japan.
  • NEDO funding: The JCHP-quantum project, within which Reimei operates, is supported by Japan's New Energy and Industrial Technology Development Organization (NEDO) under the JPNP20017 program.
  • Two active research projects: Quantum AI for materials simulation and quantum AI for biomolecular simulation were identified as projects already operating on Reimei before its public service launch.

Reimei H2 Upgrade Anchors Quantinuum and RIKEN's Expanded Quantum-AI Research Program

According to the filing, Quantinuum (NASDAQ:QNT) and RIKEN announced on November 11, 2026, that the Reimei quantum computer housed at RIKEN had successfully completed its upgrade to the H2 system model. The filing states that this upgrade "strengthens the capabilities of the quantum-HPC hybrid computing platform" of the JCHP-quantum project and "allows researchers to study more complex quantum systems, increasingly difficult to simulate using classical computing alone."

The filing describes two research projects already underway on the upgraded platform. The first combines RIKEN's ROQUO GPU quantum supercomputer with Reimei to train an AI model on quantum data for magnetism simulations, with the filing noting that "early results suggest the model can make more accurate predictions than AI models trained solely on classical simulations." The second project pairs Reimei, RIKEN's Fugaku supercomputer, and NVIDIA's evolutionary AI agent running on ROQUO to simulate a complex photoactive biomolecule, with applications the filing indicates may include more efficient solar cell design.

Beyond the upgraded research platform, the filing discloses that the partners will jointly develop a fault-tolerant quantum computer under a "Made with Japan" initiative, involving Japanese universities and domestic component suppliers. Separately, the filing states that Quantinuum, RIKEN, and SoftBank Corp. will "evaluate infrastructure readiness and examine how connected systems could support commercial quantum-AI hybrid computing services." SoftBank's Takenori Kobayashi, identified in the filing as Vice President and Head of the Product Research and Development Division, is quoted describing a goal to "develop a quantum AI data center that connects quantum computing to AI and HPC, making these capabilities accessible to companies across Japan."

What Was Disclosed

The filing announced an expanded Quantinuum-RIKEN partnership following the Reimei quantum computer's upgrade to the H2 model, covering joint fault-tolerant quantum computer development and a three-party exploration with SoftBank Corp. of connecting quantum systems to AI data centers in Japan.