  We propose a method to use lattice QCD to compute the Borel transform of the
vacuum polarization function appearing in the Shifman-Vainshtein-Zakharov QCD
sum rule. We construct the spectral sum corresponding to the Borel transform
from two-point functions computed on the Euclidean lattice. As a proof of
principle, we compute the $s \bar{s}$ correlators at three lattice spacings and
take the continuum limit. We confirm that the method yields results that are
consistent with the operator product expansion in the large Borel mass region.
The method provides a ground on which the OPE analyses can be directly compared
with nonperturbative lattice computations.
