title: Computing physical properties with quantum Monte Carlo methods with statistical fluctuations independent of system size.
abstract: We show that the recently proposed correlated sampling without reweighting procedure extends the locality (asymptotic independence of the system size) of a physical property to the statistical fluctuations of its estimator. This makes the approach potentially vastly more efficient for computing space-localized properties in large systems compared with standard correlated methods. A proof is given for a large collection of noninteracting fragments. Calculations on hydrogen chains suggest that this behavior holds not only for systems displaying short-range correlations, but also for systems with long-range correlations.
authors.affiliation: Laboratoire de Chimie Théorique, CNRS-UMR 7616, Université Pierre et Marie Curie Paris VI, Case 137, 4, place Jussieu 75252 PARIS Cedex 05, France.
authors.forename: Roland
authors.initials: R
authors.lastname: Assaraf