Fujitsu Limited and RIKEN announced the creation of a 256-qubit superconducting quantum computer, a global leader in its class, located at the RIKEN RQC-FUJITSU Collaboration Center. This new system builds on the advanced technology of their 64-qubit version, launched in October 2023 with support from Japan's Ministry of Education, Culture, Sports, Science and Technology (MEXT), and incorporates newly developed high-density implementation techniques.
Newly developed 256-qubit superconducting quantum computer. Image Credit: Fujitsu
This announcement represents a significant advancement towards the practical use of superconducting quantum computers and realizing their potential to address some of the world's most intricate problems.
Both organizations will integrate this 256-qubit superconducting quantum computer into their hybrid quantum computing platform and offer it to companies and research institutions worldwide, starting in the first quarter of fiscal year 2025. The platform's expansion from 64 to 256 qubits allows users to tackle more complex challenges, including the analysis of larger molecules and the implementation and demonstration of advanced error correction algorithms.
Looking ahead, the two organizations will further improve the platform's ease of use by working to enable smooth integration between quantum and classical computers, facilitating the efficient execution of hybrid quantum-classical algorithms.
The 256-qubit superconducting quantum computer developed by Fujitsu and RIKEN overcomes several key technical hurdles, including effective cooling within the dilution refrigerator, achieved through high-density implementation and advanced thermal design. Other important features include:
Scalable 3D Connection Structure
- Employs a 3D arrangement of 4-qubit unit cells, enabling efficient scaling of the qubit count without the need for intricate redesigns.
- The 256-qubit system utilizes the same unit cell design as the preceding 64-qubit machine, effectively showcasing the scalability of this architectural approach.
Quadrupled Implementation Density Within Dilution Refrigerator
- The implementation density within the dilution refrigerator has been quadrupled, allowing the 256-qubit system to operate within the same cooling unit as its 64-qubit predecessor.
- Features a highly optimized design that carefully manages heat generated by control circuits in relation to the refrigerator's cooling capacity, while also maintaining the required ultra-high vacuum and extremely low temperatures.
Future Plans
Fujitsu is dedicated to accelerating the real-world application of quantum computers through advancements in both hardware and software. Through its hybrid quantum computing platform, Fujitsu will offer access to larger-scale quantum computers to global companies and research institutions engaged in collaborative research across diverse fields, including finance and drug discovery.
Looking ahead, Fujitsu and RIKEN will continue their research and development efforts towards launching a 1,000-qubit computer, slated for installation in a new facility at Fujitsu Technology Park in 2026. Furthermore, the two organizations will extend the operational period of their Collaboration Center from March 2025 to March 2029 and will continue their long-term R&D into technologies that will enable the creation of even larger superconducting quantum computers.