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We propose new approach to numerical study of quantum spin systems. Ourmethod is based on a fact that one can use any set of states for the pathintegral as long as it is complete. We apply our method to one-dimensionalquantum spin system with next-to-nearest neighbor interactions. We foundremarkable improvement in negative sign problem.Comment: 11 pages, LaTeX, figures on request, YAMANASHI-93-0

Improvement in the negative-sign problem in numerical calculations of a quantum spin system