We describe an efficient numerical method for simulating the dynamics and steady states of
collective spin systems in the presence of dephasing and decay. The method is based on …

We study the magnetic phases of a nonequilibrium spin chain, where coherent interactions
between neighboring lattice sites compete with alternating gain and loss processes. This …

Numerical stochastic integration is a powerful tool for the investigation of quantum dynamics
in interacting many-body systems. As with all numerical integration of differential equations …

We present a theoretical framework based on second quantization in Liouville space to treat
open quantum systems. We consider an ensemble of identical quantum emitters …

The applicability of the so-called truncated Wigner approximation (− W) is extended to
multitime averages of Heisenberg field operators. This task splits naturally in two. First, what …

We investigate the quantum properties of the well-known process of sum frequency
generation, showing that it is potentially a very useful source of nonclassical states of the …

Focusing on two-level atoms, we apply the positive P representation to a full-wave mixed
bosonic and fermionic system of Jaynes-Cummings type and identify an advantageous …

We discuss a scheme for simulating the real-time quantum quench dynamics of interacting
quantum spin systems within the positive-P formalism. As model systems we study the …

Simulation of conditional master equations is important to describe systems under
continuous measurement and for the design of control strategies in quantum systems. For …

Superradiance, the enhanced collective emission of light from a coherent ensemble of
quantum systems, has been typically studied in atomic ensembles. In this work we study the …