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Graviton emission decoheres superpositions of matter states. We write thedecoherence rate in terms of a "differential Bondi news" function, and showthat this function can be written as an overlap integral between differentasymptotic radiative states given by Ashtekar. This result - while derived inthe linearized theory - is ultimately expressed for asymptotically flatspace-times in terms of variables with unambiguous geometric meaning in thefull theory. We treat a simple two-path experiment, and compute thedifferential news, the purity, the entanglement entropy, and the fidelity, tomake explicit the connection with the information loss.

Gravitational Decoherence, Asymptotic Quantization, and Entanglement Measures