【#Tech24H】On the road toward practical quantum computing, research teams and tech giants worldwide are deploying diverse approaches, developing qubit technologies based on photons, atomic traps, quantum dots, superconductors, and more. For instance, mainstream companies like Google and IBM are deeply invested in superconducting quantum circuits. Microsoft is focusing on topological qubits, and a physicist team at Caltech has constructed the world’s largest qubit array: an array of 6,100 neutral-atom qubits. Amid this showcase of various qubit technologies, spin qubits, once seen as minor players, have begun to stand out: four independent teams recently published breakthrough results, demonstrating significantly improved performance and sharply reduced error rates in quantum devices built with these qubits, drawing widespread academic attention. Although the most advanced spin-qubit processors currently integrate only about a dozen qubits, and there remains a long way to go toward practical application, spin qubits have emerged as a promising “dark horse” on the quantum computing track racing toward real-world computers. [ By Zhang Liyan | Tang Ruohan ]