title: On the quantum-channel capacity for orbital angular momentum-based free-space optical communications.
abstract: Inspired by recent demonstrations of orbital angular momentum-(OAM)-based single-photon communications, we propose two quantum-channel models: (i) the multidimensional quantum-key distribution model and (ii) the quantum teleportation model. Both models employ operator-sum representation for Kraus operators derived from OAM eigenkets transition probabilities. These models are highly important for future development of quantum-error correction schemes to extend the transmission distance and improve date rates of OAM quantum communications. By using these models, we calculate corresponding quantum-channel capacities in the presence of atmospheric turbulence.
authors.affiliation: Department of Electrical and Computer Engineering, the University of Arizona, Tucson, Arizona 85721, USA.
authors.forename: Yequn
authors.initials: Y
authors.lastname: Zhang
authors.forename: Ivan B
authors.initials: IB
authors.lastname: Djordjevic
authors.forename: Xin
authors.initials: X
authors.lastname: Gao