Open quantum systems (OQSs) cannot always be described with the Markov approximation,
which requires a large separation of system and environment time scales. An overview is …

We discuss the properties of atom-photon bound states in waveguide QED systems
consisting of single or multiple atoms coupled strongly to a finite-bandwidth photonic …

Optical mirrors determine cavity properties by means of light reflection. Imperfect reflection
gives rise to open cavities with photon loss. We study an open cavity made of atom-dimer …

High-dimensional quantum systems have been used to reveal interesting fundamental
physics and to improve information capacity and noise resilience in quantum information …

Quantum optics with giant emitters has shown a new route for the observation and
manipulation of non-Markovian properties in waveguide QED. In this paper we extend the …

We study the spontaneous decay of an impurity coupled to a linear array of bosonic cavities
forming a single-band photonic waveguide. The average frequency of the emitted photon is …

Starting from the paradigmatic spin-boson model (SBM), we investigate the static and
dynamical properties of a system of two distant two-level emitters coupled to a one …

The global coupling of few-level quantum systems (“spins”) to a discrete set of bosonic
modes is a key ingredient for many applications in quantum science, including large-scale …

In this work we develop a semianalytical variational Ansatz to study the properties of few-
photon excitations interacting with a collection of quantum emitters in regimes that go …

We consider two noninteracting two-level emitters that are coupled weakly to a one-
dimensional nonlinear waveguide. Due to the Kerr-like nonlinearity, the waveguide …