Abstract
The estimation of differences using Quantum Monte Carlo enlarges the scope of these methods as it provides information on several quantities of physical interest. A direct calculation of derivatives by means of uncorrelated differences leads usually to results which are masked by the statistical variance of the measure. The method we propose relies on general ideas behind correlated sampling and is a kind of generalization of the reweighting method, vastly used in variational Monte Carlo applications. The efficiency and implementation of the method is shown in an explicit calculation of the binding energy of one 3He atom in superfluid 4He and its kinetic energy.
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