Fujitsu Limited and RIKEN have announced the successful development of a cutting-edge 256-qubit superconducting quantum computer—positioning themselves at the forefront of quantum technology. Built at the RIKEN RQC-Fujitsu Collaboration Center, this milestone system significantly scales up from their previous 64-qubit model introduced in October 2023, leveraging newly engineered high-density integration techniques.
This advancement represents a major leap toward the real-world deployment of superconducting quantum systems, aiming to tackle highly complex scientific and industrial challenges—from molecular simulation to quantum error correction research.
Beginning in Q1 of fiscal 2025, the 256-qubit quantum computer will be integrated into Fujitsu’s hybrid quantum computing platform and made available globally to enterprises and research institutions. With the expanded qubit count, the platform will enable users to simulate larger molecules, implement more advanced quantum algorithms, and explore deeper into quantum error correction.
A core innovation of the system lies in its scalable architecture: it reuses the proven 4-qubit unit cell design from the 64-qubit model, but arranged in a 3D configuration. This design simplifies scaling and minimizes the need for complex hardware redesigns. Additionally, the system incorporates a next-gen thermal architecture that ensures stable operation within a dilution refrigerator, addressing critical cooling challenges as qubit density increases.
Looking ahead, Fujitsu and RIKEN plan to further refine the hybrid computing experience by improving interoperability between classical and quantum systems—paving the way for more efficient hybrid algorithms. R&D efforts are already underway for the next goal: a 1,000-qubit system set to launch in 2026 at the upcoming Fujitsu Technology Park.
