# FeynDyn: A MATLAB program for fast numerical Feynman integral calculations for open quantum system dynamics on GPUs

## Description

Abstract This MATLAB program calculates the dynamics of the reduced density matrix of an open quantum system modeled either by the Feynman–Vernon model or the Caldeira–Leggett model. The user gives the program a Hamiltonian matrix that describes the open quantum system as if it were in isolation, a matrix of the same size that describes how that system couples to its environment, and a spectral distribution function and temperature describing the environment’s influence on it, in addition to the open ... Title of program: FeynDyn Catalogue Id: AEPX_v1_0 Nature of problem Calculating the dynamics of the reduced density operator of an open quantum system. Versions of this program held in the CPC repository in Mendeley Data AEPX_v1_0; FeynDyn; 10.1016/j.cpc.2013.07.001 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)