Strong electronic correlations pose one of the biggest challenges to solid state theory.
Recently developed methods that address this problem by starting with the local, eminently …

The Hubbard model represents the fundamental model for interacting quantum systems and
electronic correlations. Using the two-dimensional half-filled Hubbard model at weak …

We present numerical results for the equation of state of an infinite chain of hydrogen atoms.
A variety of modern many-body methods are employed, with exhaustive cross-checks and …

Simulations of finite temperature quantum systems provide imaginary frequency Green's
functions that correspond one to one to experimentally measurable real-frequency spectral …

Finite-temperature quantum field theories are formulated in terms of Green's functions and
self-energies on the Matsubara axis. In multiorbital systems, these quantities are related to …

Green's functions of fermions are described by matrix-valued Herglotz-Nevanlinna functions.
Since analytic continuation is fundamentally an ill-posed problem, the causal space …

We describe the hybridization-expansion continuous-time quantum Monte Carlo code
package “w2dynamics”, developed in Wien and Würzburg. We discuss the main features of …

Model-independent compact representations of imaginary-time data are presented in terms
of the intermediate representation (IR) of analytical continuation. We demonstrate the …

Spin squeezing is a form of entanglement that reshapes the quantum projection noise to
improve measurement precision. Here, we provide numerical and analytic evidence for the …

We present Maxent, a tool for performing analytic continuation of spectral functions using the
maximum entropy method. The code operates on discrete imaginary axis datasets (values …