Trends and Prospects of Silicon Quantum Bit Research

There are high expectations for the development of quantum computers that can solve complex problems. To achieve this, both high-fidelity and highly-integrated qubits are required. Research and development is progressing in various physical systems, and silicon quantum bits are one of the leading candidates because of their long coherence times and compatibility with mature silicon technology. In this talk, I will first provide an overview of the basic knowledge of semiconductor qubits. Then I will introduce global research and development trends related to high fidelity, qubit integration, and various peripheral technologies. I will also discuss silicon qubit devices we have fabricated so far, as well as our research results in charge detection, spin blockade, spin manipulation, and RF reflectometry.