Fujitsu and RIKEN have developed a 256-qubit superconducting quantum computer, a significant advancement in quantum computing technology. Constructed at the RIKEN RQC-FUJITSU Collaboration Center in Japan, this system quadruples the capacity of their previous 64-qubit model, introduced in October 2023. Supported by Japan’s Ministry of Education, Culture, Sports, Science and Technology (MEXT), the new computer utilizes high-density implementation techniques and a scalable 3D connection structure.

This enhanced system maintains the same cooling infrastructure as its predecessor while offering increased computational capabilities. It will be accessible to global companies and research institutions through Fujitsu and RIKEN’s hybrid quantum computing platform starting in the first quarter of fiscal 2025. The platform will enable researchers to tackle complex challenges, such as large-scale molecular simulations and advanced error correction algorithms, fostering progress in fields like finance and drug discovery.

Key features of the 256-qubit system include a scalable 3D architecture based on repeatable 4-qubit unit cells, demonstrating potential for future expansion. The design achieves a fourfold increase in implementation density within the dilution refrigerator, ensuring efficient operation at ultra-low temperatures. Fujitsu and RIKEN aim to integrate quantum and classical computing seamlessly, enhancing the performance of hybrid algorithms for practical applications.

Looking forward, Fujitsu and RIKEN plan to develop a 1,000-qubit quantum computer by 2026, to be housed at a new facility in Fujitsu Technology Park. The RIKEN RQC-FUJITSU Collaboration Center’s operations have been extended through March 2029, reflecting a sustained commitment to advancing quantum research and development.

Shintaro Sato, Head of the Quantum Laboratory at Fujitsu Research, stated: “This breakthrough demonstrates our ability to scale quantum systems efficiently while maintaining performance. The 256-qubit computer opens new possibilities for solving real-world problems.” Similarly, Yasunobu Nakamura, Director of the RIKEN Center for Quantum Computing, said: “Our collaboration with Fujitsu is pushing the boundaries of quantum technology, positioning us to deliver impactful solutions for global challenges.”

This achievement highlights Fujitsu and RIKEN’s leadership in quantum computing innovation. By expanding the capabilities of their hybrid platform and planning for future advancements, they are contributing to the global effort to realize the transformative potential of quantum technology.