Light and matter can strongly mix together to form hybrid particles called polaritons. In recent
years, polaritons in the so-called ultrastrong coupling (USC) regime have attracted much …

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 …

We theoretically study how the peculiar properties of the vacuum state of an ultra-strongly
coupled system can affect basic light-matter interaction processes. In this unconventional …

The hybridization of light and matter excitations in the form of polaritons has enabled major
advances in understanding and controlling optical nonlinearities. Entering the quantum …

The “marriage” of light (ie, photon) and matter (ie, exciton) in semiconductors leads to the
formation of hybrid quasiparticles called exciton polaritons with fascinating quantum …

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 …

BACKGROUND One of the most important phenomena in cavity quantum electrodynamics
(cQED) is the so-called strong coupling regime, which appears when the interaction …

The regime of ultrastrong light-matter interaction has been investigated theoretically and
experimentally, using zero-dimensional electromagnetic resonators coupled with an …

In this article, we qualitatively describe the concepts and the state of the art regarding strong
light–matter interactions. We provide a concise description of the relevant background …

Exotic quantum vacuum phenomena are predicted in cavity quantum electrodynamics
systems with ultrastrong light-matter interactions. Their ground states are predicted to be …