Microwave Technology for Quantum Processors

Abstract

Microwave technology is an essential aspect of the construction and operation of quantum computers. Quantum computers have the potential to revolutionize many fields by providing exponential improvements in computational power and efficiency. In this doctoral thesis, the author discusses the development and validation of microwave cryogenic interfaces, such as superconducting coaxial cables and microwave packaging, as well as the design of the quantum processor unit (QPU) chips, including single qubit and multi-qubit prototypes. Additionally, the thesis covers the system design of the quantum computer systems and interconnects, and the development of electronics, mechanical, and software solutions for high frequency readout of the QPU. The author also presents a case study on the integration of these QPU chips into a functional quantum computer prototype and discusses the results of tests performed on this prototype. The prototype was able to successfully demonstrate acceptable decay time and readout fidelity, a critical requirement for the operation of a scalable quantum computer. The author also discusses the future potential applications of quantum computers and the challenges that must be overcome for their widespread adoption.

Date of Award	22 Nov 2023
Original language	English
Supervisor	Pol Forn Diaz (Director) & Pedro Antonio de Paco Sanchez (Director)