Quantum computing is poised to reach a tipping point in three to five years by becoming useful for solving real-world problems, as computers harnessing about 500 qubits become a reality, according to Chinese start-up SpinQ. Founded in 2018 and based in Shenzhen, SpinQ has two main product lines: small-scale nuclear magnetic resonance (NMR) quantum computers with about three qubits for educational use and industrial-grade superconducting quantum computers with up to 20 qubits. In 2020, SpinQ...