This science popularization article focuses on the crucial role of ‘quantum metrology’ in the advancement of quantum computing toward engineering applications, in order to help readers grasp the significance of precise measurement in quantum technology. The article highlights that quantum metrology provides a “measuring scale” for quantum computing systems, ensuring operational reliability and result credibility. It explains in accessible terms cutting-edge technologies such as quantum benchmarks based on fundamental constants, precise timing and electrical control, and multidimensional quantum sensing. These methods underpin stable qubit manipulation and high-fidelity quantum gate operations. The article emphasizes that as quantum computing advances toward scaling and practical applications, establishing a unified national quantum measurement standards system and integrated metrology infrastructure is crucial. This not only determines the comparability and mutual recognition of results across different platforms but also impacts the autonomy, controllability, and trustworthy output of the quantum industry. The paper concludes by introducing the concept of “metrology bit”, envisioning the development potential of deep integration between quantum metrology and quantum computing. The author argues that this integration will lay a solid foundation for building a trustworthy, controllable, and verifiable quantum information system.