Fujitsu has debuted a working prototype of a quantum computer built on diamond spin qubits. The company is betting on photonic connections to scale the system and is aiming to roll out a multi-module version by 2027.

How the Prototype Works

The tech is based on tin-vacancy (SnV) centers in diamond, which serve as qubits. These are integrated with photonic integrated circuits, letting the system read quantum states using light.

According to Fujitsu, the prototype operates at around −271.6°C.

Scaling with Photonics

Fujitsu plans to link modules together using photonic connections. The company says this approach should enable the architecture to scale up, with a multi-module setup targeted for 2027.

Why the Market Cares

Diamond spin qubits and optical integration offer an alternative path for building quantum systems. If Fujitsu delivers on its multi-module roadmap, the industry will get a new hardware platform option focused on photonic readout and connectivity.