  Quantum theories of gravity help us to improve our insight into the
gravitational interactions. Motivated by the interesting effect of gravity on
the photon trajectory, we treat a quantum recipe concluding a classical
interaction of light and a massive object such as the sun. We use the linear
quantum gravity to compute the classical potential of a photon interacting with
a massive scalar. The leading terms have a traditional $1/r$ subordinate and
demonstrate a polarization-dependent behavior. This result challenges the
equivalence principle; attractive and/or repulsive interactions are admissible.
