Ultrastrong coupling between light and matter has, in the past decade, transitioned from a
theoretical idea to an experimental reality. It is a new regime of quantum light–matter …

Recent experiments have demonstrated that light and matter can mix together to an extreme
degree, and previously uncharted regimes of light-matter interactions are currently being …

In the regime of deep strong light–matter coupling, the coupling strength exceeds the
transition energies of the material,–, fundamentally changing its properties,; for example, the …

In the past 20 years, impressive progress has been made both experimentally and
theoretically in superconducting quantum circuits, which provide a platform for manipulating …

Interactions between light and matter play an instrumental role in spectroscopy, sensing,
quantum information processing and lasers. In most of these applications, light is considered …

The permutational invariance of identical two-level systems allows for an exponential
reduction in the computational resources required to study the Lindblad dynamics of …

In quantum electrodynamics, the choice of gauge influences the form of light–matter
interactions. However, gauge invariance implies that all physical results should be …

We propose an experimentally feasible method for enhancing the atom-field coupling as
well as the ratio between this coupling and dissipation (ie, cooperativity) in an optical cavity …

We revisit the derivation of Rabi-and Dicke-type models, which are commonly used for the
study of quantum light-matter interactions in cavity and circuit QED. We demonstrate that the …

Already in the first edition of this book [1], a great number of interesting and important
applications for Josephson junctions were discussed. In the decades that have passed since …