01928nas a2200133 4500008003900000245009200039210006900131300001100200490000700211520147100218100002901689700002001718856005601738 2017 d00aNon-{Gaussian} operations on bosonic modes of light: {Photon}-added {Gaussian} channels0 aNon Gaussian operations on bosonic modes of light Photon added G a0623090 v953 aWe present a framework for studying bosonic non-Gaussian channels of continuous-variable systems. Our emphasis is on a class of channels that we call photon-added Gaussian channels, which are experimentally viable with current quantum-optical technologies. A strong motivation for considering these channels is the fact that it is compulsory to go beyond the Gaussian domain for numerous tasks in continuous-variable quantum information processing such as entanglement distillation from Gaussian states and universal quantum computation. The single-mode photon-added channels we consider are obtained by using two-mode beam splitters and squeezing operators with photon addition applied to the ancilla ports giving rise to families of non-Gaussian channels. For each such channel, we derive its operator-sum representation, indispensable in the present context. We observe that these channels are Fock preserving (coherence nongenerating). We then report two examples of activation using our scheme of photon addition, that of quantum-optical nonclassicality at outputs of channels that would otherwise output only classical states and of both the quantum and private communication capacities, hinting at far-reaching applications for quantum-optical communication. Further, we see that noisy Gaussian channels can be expressed as a convex mixture of these non-Gaussian channels. We also present other physical and information-theoretic properties of these channels.1 aSabapathy, Krishna Kumar1 aWinter, Andreas uhttps://link.aps.org/doi/10.1103/PhysRevA.95.062309