Hi, I would like to use the Quantum Wang-Landau app to obtain some benchmark results for the free energy of a spin chain. To make sure I understood the parameters I decided to do the two-qubit Heisenberg model first (with open BC's). Unfortunately, no matter how I adjust the parameters the resulting energies seem quite poor compared to my exact calcuation in Mathematica.
To be more specific, I've been adjusting the CUTOFF parameter to between 100-1000 and the number of WL steps from 16-25. The results I've been seeing are energies around -0.3 at the lowest T's (where E~-0.75 in fact) and a wide variance in energies at the highest T's, often more than 30% off the actual value.
Thanks for any help!