Simulation of Feynman path integral in literature

Can someone provide me a numerical simulation of Feynman path integral? Where the contribution of each path is added individually so that I can understand how much do the paths outside the light cone actually contribute and how they actually interfere destructively with each other?

• You might be interested in Quantum Monte Carlo techniques, specifically Markov Chain Monte Carlo. You don't sum over each path but you do a bunch of sampling techniques that make your life a lot easier and the computation far less intense. – AureySteader Mar 5 at 21:51