  We describe a novel simulation method that eliminates the slowing-down
problem in the Monte Carlo simulations of imaginary-time path integrals near
the continuum limit. This method combines a stochastic blocking procedure with
the multigrid method to rapidly accelerate the sampling of paths in a quantum
Monte Carlo simulation, making its dynamics more ergodic. The effectiveness and
efficiency of this method are demonstrated for several one-dimensional quantum
systems and compared to other standard and accelerated methods.
