Variational Monte Carlo sampling techniques

Other devices for improving the efficiency of the sampling techniques in Monte Carlo calculations are Russian roulette and splitting described by Kahn [4], the conditional Monte Carlo of Trotter and Tukey [6], and the antithetic variates of Hammersley and Morton [7 8]. It is likely that further powerful techniques of this sort await discovery, whereby the usefulness of Monte Carlo for practical problems may be greatly extended. 

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