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 …

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

Photonic crystals are a powerful tool for the manipulation of optical dispersion and density of
states, and have thus been used in applications from photon generation to quantum sensing …

Quantum systems are invariably open, evolving under surrounding influences rather than in
isolation. Standard open quantum system methods eliminate all information on the …

We study a quantum heat engine at strong coupling between the system and the thermal
reservoirs. Exploiting a collective coordinate map**, we incorporate system-reservoir …

Many-body correlations and macroscopic quantum behaviours are fascinating condensed
matter problems. A powerful test-bed for the many-body concepts and methods is the Kondo …

The interaction between light and matter remains a central topic in modern physics despite
decades of intensive research. Coupling an isolated emitter to a single mode of the …

We review recent developments regarding the quantum dynamics and many-body physics
with light, in superconducting circuits and Josephson analogues, by analogy with atomic …

Dissipative quantum phase transition has been widely believed to occur in a Josephson
junction coupled to a resistor despite a lack of concrete experimental evidence. Here, on the …

We present an overview of the reaction coordinate approach to handling strong system-
reservoir interactions in quantum thermodynamics. This technique is based on incorporating …