Engineering in superconducting quantum computers

Dat Thanh Le

H. Shiomi

This paper introduces superconducting computers. from the perspective of microwave engineering. It provides a system-level overview of cryo-genic quantum hardware and explains how microwave pulses are used to control and read out quantum bits (qubits). Key concepts such as superposition, Bloch sphere representation, and the role of resonators are discussed. The paper also outlines the design of a scalable control system developed at QIQB, Osaka University, including its architecture and synchronization performance. Finally, challenges and future directions toward fault-tolerant quantum computing, including quantum error correction and cryogenic signal multiplexing, are .addressed.

Daniel D. Stancil, Gregory T. Byrd

Yasunobu Nakamura

Jaw-Shen Tsai

Intensive research on the construction of superconducting quantum computers has produced numerous important achievements. The quantum bit (qubit), based on the Josephson junction, is at the heart of this research. This macroscopic system has the ability to control quantum coherence. This article reviews the current state of quantum computing as well as its history, and discusses its future. Although progress has been rapid, the field remains beset with unsolved issues, and there are still many new research opportunities open to physicists and engineers.

Yonuk Chong, Jaewoo Joo