A New Monte Carlo Algorithm for Free Energy Calculation
  We propose a new Monte Carlo algorithm for the free energy calculation based on configuration space sampling. We implement this algorithm for Ising model. Comparison with the exact free energy shows an excellent agreement. We analyse the properties of this algorithm and compares it with Wang-Landau algorithm which samples in energy space. This method is applicable to classical statistical models. The possibility of extending it to quantum systems is discussed. 
Sheng Bi, Ning-Hua Tong
cond-mat.str-el cond-mat.stat-mech