Fujitsu develops diamond-spin quantum computer prototype
The prototype uses light to link modules and could reach 250 logical qubits by fiscal 2030, Fujitsu said.
- On Tuesday, Sept 8, 2026, Fujitsu announced the world's first working diamond-spin quantum computer prototype incorporating tin-vacancy centers into photonic integrated circuits.
- Engineers selected SnV centers over conventional nitrogen-vacancy centers because their symmetrical structure resists external noise and emit light at roughly 10 times the brightness of NV centers.
- The prototype operates at-456.9 degrees Fahrenheit , roughly 2.8 degrees Fahrenheit warmer than superconducting quantum computers and constructed using bonded tin-implanted diamond substrates.
- This prototype results from joint research started in 2020 between Fujitsu, Delft University, and QuTech. "We are delighted to announce this prototype," said General Director Kees Eijkel, QuTech, Delft University of Technology.
- Fujitsu plans to create a multi-module diamond-spin prototype by 2027, then develop a 250-logical-qubit system by fiscal 2030 and a 1,000-logical-qubit system by fiscal 2035.
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Fujitsu presented a quantum diamond-spin prototype at -271.6°C, with SnV centers and a plan for 1,000 logical quabits in 2035.
Japanese company develops experimental system that uses "spins" of atomic defects in diamond as qubits | The technology is designed to combine quantum stability, photonic components, and the possibility of expanding into modular systems - on the way to a goal of thousands of logical qubits in the next decade
Fujitsu developed a functional quantum computer prototype that uses microscopic defects in diamonds such as qubits and photonic circuits to connect them by light. The Japanese company believes that this architecture could facilitate the construction of large-scale modular quantum systems and expects to reach 250 logical qubits by 2030 and 1,000 by 2035.
Fujitsu Fabricates Diamond-Spin QPU Prototype Integrating Tin-Vacancy Centers and Photonic ICs
https://youtu.be/bba0OTdM0Yc Japanese IT group Fujitsu Limited has announced a physical hardware milestone in solid-state quantum architectures, fabricating a working prototype diamond-spin quantum processing unit (QPU) that integrates tin-vacancy (SnV) color centers directly into photonic integrated circuits (PICs). Developed in collaboration with QuTech (TU Delft) and the University of Tokyo, the platform operates at a cryogenic [...]
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