  It is shown that the Jordan frame and its conformally transformed version,
the Einstein frame of nonminimally coupled theories of gravity, are actually
equivalent at the quantum level. The example of the theory taken up is the
Brans-Dicke theory, and the wave packet calculations are done for a homogeneous
and isotropic cosmological model in the purest form of the theory, i.e., in the
absence of any additional matter sector. The calculations are clean and exact,
and the result obtained are unambiguous.
