Control System of Superconducting Quantum Computers.

The past two decades have witnessed the rapid development of quantum computers. Superconducting circuits are one of the most attractive platforms, and its corresponding precise control system is crucial. Here, a brief review of the room-temperature and cryogenic control systems of superconducting quantum circuits is given. The microwave devices required by the system are introduced, followed by a description of the operation of single-qubit and two-qubit gates, readout techniques, quantum tomography for fidelity characterization, and feedforward and feedback controls. Some future directions are provided for the research and development of control systems for large-scale, fault-tolerant quantum computers. [ABSTRACT FROM AUTHOR]