Entanglement is one of the most fascinating properties of quantum mechanical systems;
when two particles are entangled the measurement of the properties of one of the two allows …

A theory of time-delayed coherent quantum feedback is developed. More specifically, we
consider a quantum system coupled to a bosonic reservoir creating a unidirectional …

How small can a laser be made? What characteristic properties must a device possess to
still be called a laser? How can one prove laser action in the limiting cases of single-emitter …

In this paper we generalize the numerically exact expansion scheme for many two-level
systems coupled to a bosonic (cavity) mode under open system conditions to the case of …

We report on the optical preparation of coherent superpositions of exciton and biexciton
states manifested in temporal nonlinear oscillations in interacting exciton gases. The effect is …

Using the example of the Jaynes-Cummings model, we present a comparison between time-
delayed coherent feedback mediated by reservoirs with continuous-and discrete-mode …

The dynamics of waveguide-QED systems involving coherent time-delayed feedback give
rise to a hierarchy of multitime correlations within the Heisenberg picture due to the induced …

We present an analytical solution of the single-photon quantum feedback in a cavity
quantum electrodynamics system based on a half-cavity setup coupled to a structured …

We compare three different notions of concurrence to measure the polarization
entanglement of two-photon states generated by the biexciton cascade in a quantum dot …

In a recent publication we showed that permutation symmetry reduces the numerical
complexity of Lindblad quantum master equations for identical multi-level systems from …