  Rietsch constructed a candidate $T$-equivariant mirror LG model for any flag
variety $G/P$. In this paper, we prove the following mirror symmetry
prediction: the small $T\times\mathbb{G}_m$-equivariant quantum cohomology of
$G/P$ equipped with quantum connection is isomorphic as $D$-modules to the
Brieskorn lattice associated to the LG model equipped with Gauss-Manin
connection.
