A Multilevel Blocking Approach to the Sign Problem in Real-Time Quantum Monte Carlo Simulations
C. H. Mak, R. Egger
Abstract
We propose a novel approach toward the general solution of the sign problem in real-time path-integral simulations. Using a recursive multilevel blocking strategy, this method circumvents the sign problem by synthesizing the phase cancellations arising from interfering quantum paths on multiple timescales. A number of numerical examples with one or a few explicit degrees of freedom illustrate the usefulness of the method.
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