Physics – Condensed Matter
Scientific paper
1994-04-14
Physics
Condensed Matter
7 pages Revtex 3.0 and psfig1.8. Five postcript figures. Use uufiles to decode
Scientific paper
10.1103/PhysRevE.50.R2411
A method is developed which speeds up averaging in quantum simulations where minus signs cause difficulties. A Langevin equation method in conjunction with a replication algorithm is used enabling one to average over a continuously varying complex number. Instead of ensemble averaging this number directly, the phase of the complex number is followed over time. The method is illustrated in some simple cases where the answers obtained can be compared to exact results, and also compared to conventional averaging procedures which converge orders of magnitude slower than this method. Limitations of this method are also described.
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