Core devices for superconducting quantum computing

Computing power is a new source of productivity in the era of digital economy. Quantum computing, which is built on the principles of quantum mechanics, is believed to be capable of performing tasks that cannot be computed by classical computers, and will exhibit great advantages in the near future. As one of the most promising platforms for universal quantum computing, superconducting qubits possess unique advantages including stability, reliability, and convenient production in quantum control and measurement. In this article we review the principle and properties of superconducting qubits based on nonlinear and nondissipative Josephson junctions. We then summarize some recent developments in fabrication. Finally, we briefly summarize the outlook for superconducting quantum computing.