Circuit quantum electrodynamics (QED) is the study of the interaction of nonlinear superconducting circuits, acting as artificial atoms or as qubits for quantum information processing, with quantized electromagnetic fields in the microwave-frequency domain. First introduced in 2004 in these papers (paper 1, paper 2), it now plays an essential role in all current approaches to gate-based digital quantum information processing with superconducting circuits. Two recent reviews from the group cover the many advances of the field since its creation. First, a short review (paper 3) covers the essential aspects of the field as part of a focus issue on circuit QED in Nature Physics. For a deeper dive, this Reviews of Modern Physics article (paper 4) aims at giving the reader a solid background on the foundations of circuit QED.
Focus issue: https://www.nature.com/collections/eeaajiebhi