Superconducting Qubits: Circuit QED Technology

This lecture covers the strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics technology. It discusses the integration of superconducting circuit QED technology, focusing on the coupling of superconducting qubits via a cavity bus. The lecture also addresses the relaxation and dephasing mechanisms in superconducting qubits, as well as the impact of environmental noise on qubit dynamics. Various sources of dephasing, such as flux noise and quasiparticle-induced relaxation, are explored. Additionally, the lecture delves into the challenges posed by two-level systems ensembles and the relaxation induced by material defects in superconducting circuits.