  Strong quantum-correlated sources are essential but delicate resources for
quantum information science and engineering protocols. Decoherence and loss are
the two main disruptive processes that lead to the loss of nonclassical
behavior in quantum correlations. In quantum systems, scattering can contribute
to both decoherence and loss. In this work, we present an experimental scheme
capable of significantly mitigating the adverse impact of scattering in quantum
systems. Our quantum system is composed of a two-mode squeezed light generated
with the four-wave mixing process in hot rubidium vapor, and a scatterer is
introduced to one of the two modes. An integrating sphere is then placed after
the scatterer to recollect the scattered photons. We use mutual information
between the two modes as the measure of quantum correlations, and demonstrate a
47.5% mutual information recovery from scattering, despite an enormous photon
loss of greater than 85%. Our scheme is a pioneering step towards recovering
quantum correlations from disruptive random processes, thus has the potential
to bridge the gap between proof-of-principle demonstrations and practical
real-world deployments of quantum protocols.
