Quantum Cavity Qubit Interaction

This lecture delves into the interaction between a superconducting platform and a qubit, explaining the importance of coupling them together to efficiently read out the qubit state. The instructor covers the modeling of the electromagnetic field in the cavity, the introduction of effective two-level systems, and the significance of reaching the strong coupling regime. The lecture details the design considerations for placing qubits in different types of cavities, emphasizing the need to optimize the coupling strength. It also explores the spectroscopic methods used to confirm strong coupling and the transition to dispersive interactions for qubit readout. The discussion concludes with the potential for quantum non-demolition measurements in this system.