  QmeQ is an open-source Python package for numerical modeling of transport
through quantum dot devices with strong electron-electron interactions using
various approximate master equation approaches. The package provides a
framework for calculating stationary particle or energy currents driven by
differences in chemical potentials or temperatures between the leads which are
tunnel coupled to the quantum dots. The electronic structures of the quantum
dots are described by their single-particle states and the Coulomb matrix
elements between the states. When transport is treated perturbatively to lowest
order in the tunneling couplings, the possible approaches are Pauli
(classical), first-order Redfield, and first-order von Neumann master
equations, and a particular form of the Lindblad equation. When all processes
involving two-particle excitations in the leads are of interest, the
second-order von Neumann approach can be applied. All these approaches are
implemented in QmeQ. We here give an overview of the basic structure of the
package, give examples of transport calculations, and outline the range of
applicability of the different approximate approaches.

Mesoscale and Nanoscale Physics