  The Bell's inequality is a strong criterion to distinguish classical and
quantum mechanical aspects of reality. Its violation is the net effect of the
existence of non-locality in systems, an advantage for quantum mechanics (QM)
over classical physics. The quantum mechanical world is under the control of
the Heisenberg uncertainty principle (HUP) that is generalized by quantum
gravity (QG) scenarios, called generalized uncertainty principle (GUP). Here,
the effects of GUP on the square of Bell operators of qubits and qutrits are
studied. The achievements claim that the violation quality of the square of
Bell inequalities may be a tool to get a better understanding of the quantum
features of gravity. In this regard, it is obtained that the current accuracy
of the Stern-Gerlach experiments implies upper bounds on the values of the GUP
parameters.
