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By employing the full counting statistics formalism, we characterize thefirst moment of energy that is exchanged during a generally non-Markovianevolution in non-driven continuous variables systems. In particular, we focuson the evaluation of the energy flowing back from the environment into the openquantum system. We apply these results to the quantum Brownian motion, wherethese quantities are calculated both analytically, under the weak couplingassumption, and numerically also in the strong coupling regime. Finally, wecharacterize the non-Markovianity of the reduced dynamics through a recentlyintroduced witness based on the so-called Gaussian interferometric power and wediscuss its relationship with the energy backflow measure.

Energy backflow in strongly coupled non-Markovian continuous-variables systems