  We present a GPU based openACC fortran program named HeTDSE, which provides
an efficient way to investigate the non-perturbative electronic dynamics of
helium subjected to a strong laser pulse by solving full-dimensional
two-electron time dependent Schr\"{o}dinger equation (TDSE). OpenACC is a
directive-based programming model for accelerators without modifying the
underlying CPU code itself. HeTDSE uses B-Spline basis sets expansion method to
construct the radial part of the wavefunction, and the spherical harmonic
functions is used to express for the angular part. Adams algorithm is employed
for the time propagation. Our example shows HeTDSE running on an NVIDIA Kepler
K20 GPU can outperform the one on an Intel E5-2640 single CPU core by a factor
of 147.
