  Graviton emission decoheres superpositions of matter states. We write the
decoherence rate in terms of a "differential Bondi news" function, and show
that this function can be written as an overlap integral between different
asymptotic radiative states given by Ashtekar. This result - while derived in
the linearized theory - is ultimately expressed for asymptotically flat
space-times in terms of variables with unambiguous geometric meaning in the
full theory. We treat a simple two-path experiment, and compute the
differential news, the purity, the entanglement entropy, and the fidelity, to
make explicit the connection with the information loss.
