  Observable scattering processes entail emission-absorption of soft photons.
As these degrees of freedom go undetected, some information is lost. Whether
some of this information can be recovered in the observation of the hard
photons, depends of the actual pattern of the scrambling of information. We
compute the information scrambling of photon scattering by the tripartite
mutual information in terms of the 2-Renyi entropy, and find a finite amount of
scrambling is present. The developed procedure thus sheds novel light on the
black hole information loss paradox, showing that scrambling is a byproduct of
decoherence achieved by the scattering system in its interaction with the
environment, due to the emission-absorption of soft photons in fully unitary
processes.
