Mehul Malik, Malcolm O'Sullivan, Brandon Rodenburg, Mohammad Mirhosseini, Jonathan Leach, Martin P. J. Lavery, Miles J. Padgett, Robert W. Boyd
We describe an experimental implementation of a free-space 11-dimensional quantum key distribution (QKD) system using orbital angular momentum (OAM) modes. This QKD system has a maximum theoretical channel capacity of log2(11) = 3.46 bits/photon. The effects of Kolmogorov thin-phase turbulence on the OAM channel capacity of this QKD system are quantified. We find that increasing the turbulence leads to a degradation of the channel capacity of the OAM channel. We are able to mitigate the effects of turbulence by increasing the spacing between detected modes.
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http://arxiv.org/abs/1204.5781
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