Fujitsu has developed a prototype diamond-spin quantum computer that incorporates tin-vacancy (SnV) centres into photonic integrated circuits The prototype can operate at -271.6°C, higher than the typical operating temperature of a superconducting quantum computer, and Fujitsu has demonstrated in a test environment that it can be used via the Fujitsu Hybrid Quantum Computing Platform without additional specialist knowledge. This development marks a significant milestone toward a modular architecture, one of the most promising approaches for scaling quantum computers, thanks to its high fidelity and efficient optical connectivity. The prototype builds on joint research started in 2020 by Fujitsu, Delft University of Technology, and QuTech, a quantum technology research institute part of TU Delft. Fujitsu will develop a prototype of a multi-module diamond-spin quantum computer by 2027. Fujitsu will also begin developing technologies to integrate the diamond-spin with a superconducting approach, accelerating progress toward large-scale quantum computers. This initiative is part of Fujitsu’s quantum roadmap, which outlines the company’s aim to realise practical quantum computing by 2030. Vivek Mahajan, corporate executive officer, corporate vice president, CTO, in charge of System Platform, Fujitsu Limited, said, “The diamond-spin approach we have applied in this prototype not only offers exceptional scalability in its own right, but also has the potential to be integrated with superconducting quantum computers to further extend their capabilities, enabling more complex and large-scale computations. “Under our roadmap to achieve a 250 logical qubit system by fiscal 2030 and a 1,000 logical qubit system by fiscal 2035, Fujitsu will continue advancing practical quantum computing across a broad range of areas, from software to hardware, while leveraging the key advantages of the diamond-spin approach, including high fidelity and optical connectivity.” Dr Kees Eijkel, general director, QuTech, Delft University of Technology, said, “We are delighted to announce this prototype diamond spin quantum computer