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 present an overview of recent advances in the study of energy dynamics and
mechanisms for energy conversion in qubit systems with special focus on realizations in …

We propose tunable chiral bound states in a system composed of superconducting giant
atoms and a Josephson photonic-crystal waveguide (PCW), with no analog in other …

A microwave amplifier combining noise performances as close as possible to the quantum
limit with large bandwidth and high saturation power is highly desirable for many solid-state …

Multimode cavity quantum electrodynamics—where a two-level system interacts
simultaneously with many cavity modes—provides a versatile framework for quantum …

Engineering the electromagnetic environment of a quantum emitter gives rise to a plethora
of exotic light-matter interactions. In particular, photonic lattices can seed long-lived atom …

A quantum system weakly coupled to a zero-temperature environment will relax, via
spontaneous emission, to its ground-state. However, when the coupling to the environment …

Confinement of topological excitations into particle-like states-typically associated with
theories of elementary particles-are known to occur in condensed matter systems, arising as …

The modern primary voltage standard is based on the ac Josephson effect and the ensuing
Shapiro steps, where a microwave tone applied to a Josephson junction yields a constant …

A classical particle moving in a periodic potential can localize inside a single potential
minimum, but a quantum particle forms extended states by tunnelling to neighbouring …