  We propose a numerical method of estimating various physical quantities in
lattice (supersymmetric) quantum mechanics. The method consists only of
deterministic processes such as computing a product of transfer matrix, and has
no statistical uncertainties. We use the numerical quadrature to define the
transfer matrix as a finite dimensional matrix, and find that it effectively
works by rescaling variable for sufficiently small lattice spacings. For a
lattice supersymmetric quantum mechanics, the correlators can be estimated
without statistical errors, and the effective masses coincide with the exact
solution within very small errors less than 0.001%. The SUSY Ward identity is
also precisely studied in compared with the Monte-Carlo method. Our method is
not limited to a lattice SUSY quantum mechanics, but is also applicable to any
other lattice models of quantum mechanics.
