The world faces increasingly complex challenges that demand computational power beyond the reach of traditional computers. Quantum computers offer the promise of tackling these previously intractable problems, driving significant advancements across numerous fields. While a fully fault-tolerant quantum computer with 1 million qubits of processing power is considered the ultimate goal, Fujitsu is focused on delivering practical solutions in the near term.
Fujitsu’s commitment to quantum computing is underscored by its ongoing R&D efforts. In August 2024, in collaboration with the University of Osaka, Fujitsu unveiled its STAR architecture, a highly efficient quantum computing architecture based on phase rotation gates. This architecture paves the way for early-FTQC systems capable of outperforming conventional computers with only 60,000 qubits [2]. On the hardware front, the RIKEN RQC-Fujitsu Collaboration Center, established in 2021 with RIKEN, has already yielded a 64-qubit superconducting quantum computer in October 2023, followed by a world-leading 256-qubit system in April 2025 [3].
Scaling to even larger systems requires overcoming challenges such as maintaining high fidelity across multiple interconnected qubit chips and achieving greater integration of components and wiring within dilution refrigerators. In addition to its superconducting approach, Fujitsu is also exploring the potential of diamond spin-based qubits, which use light for qubit connectivity. Fujitsu is conducting research in this area in collaboration with Delft University of Technology and QuTech, a leading quantum technology research institute, which has resulted in the successful creation of highly accurate and controllable qubits.