  The turbulence induced decay of orbital angular momentum (OAM) entanglement
between two photons is investigated numerically and experimentally. To compare
our results with previous work, we simulate the turbulent atmosphere with a
single phase screen based on the Kolmogorov theory of turbulence. We consider
two different scenarios: in the first only one of the two photons propagates
through turbulence, and in the second both photons propagate through
uncorrelated turbulence. Comparing the entanglement evolution for different OAM
values, we found the entanglement to be more robust in turbulence for higher
OAM values. We derive an empirical formula for the distance scale at which
entanglement decays in term of the scale parameters and the OAM value.
