  It is thought that gravitons are impossible to detect, even with the
technological ability to construct experiments larger than Jupiter. However, in
principle it is possible to detect the emission of single gravitons through the
decoherence of relativistic Planck-mass superpositions by gravitational
bremsstrahlung. Although enormous experimental challenges ensure that such an
experiment will not be achievable in the foreseeable future, this possibility
suggests that gravitons are not forever outside our empirical grasp. It is also
evidence that decoherence as a detection method has untapped potential.
