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Japan has emerged at the forefront of quantum computing with the launch of the world's largest superconducting qubit quantum computer. This advanced system, developed through years of collaboration between Fujitsu and the RIKEN institute, marks a significant stride in the global race to build powerful quantum computing machines.

Fujitsu and RIKEN have surpassed their initial projections, delivering a 256-qubit computer despite previously aiming for 100 qubits by 2025. This record-breaking achievement is attributed to an innovative architecture: qubits are organized into micro-clustered cells of four, arranged not only linearly but also in a three-dimensional structure. This design significantly increases qubit density, allowing the 256-qubit processor to fit into the same housing as its 64-qubit predecessor.

This approach is crucial for scaling quantum computers, as millions of qubits will be required for a practically applicable system. Furthermore, the Japanese computer has achieved a high density of signal and control cabling, essential for qubit operation, on par with systems from Google and IBM. This represents a substantial accomplishment, considering the complexities involved in routing numerous cables under ultra-low temperature conditions.

This 256-qubit computer is already accessible to clients worldwide via the cloud, enabling them to validate ideas and identify real-world applications for quantum computing. For the coming year, Fujitsu and RIKEN plan to introduce a 1000-qubit platform, which will represent another significant step toward creating a universal quantum computer capable of solving highly complex problems intractable for classical computers.

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Photo: Roselyne Min/Euronews