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.
© 2012 Optical Society of America
Original Manuscript: December 23, 2011
Revised Manuscript: June 26, 2012
Manuscript Accepted: June 29, 2012
Published: July 31, 2012
Yequn Zhang, Ivan B. Djordjevic, and Xin Gao, "On the quantum-channel capacity for orbital angular momentum-based free-space optical communications," Opt. Lett. 37, 3267-3269 (2012)