Combining distillation with two-level sampling reduces the statistical error of disconnected diagrams in quenched QCD, with variance scaling as 1/N1^2 when the quark loops are in different regions.
Lepage,The Analysis of Algorithms for Lattice Field Theory, inTheoretical Advanced Study Institute in Elementary Particle Physics, p
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Update on two-level sampling for glueball observables in quenched QCD
Combining distillation with two-level sampling reduces the statistical error of disconnected diagrams in quenched QCD, with variance scaling as 1/N1^2 when the quark loops are in different regions.