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We study the evolution of an orbital angular momentum (OAM) entangledbipartite photonic state for the case where one of the photons propagatesthrough Kolmogorov turbulence, using the concurrence as a measure ofentanglement. Quantum state tomography was performed to reconstruct the twoqubit density matrices for a range of scintillation strengths. Our results givethe first direct experimental confirmation of the existing theories for decayof entanglement due to atmospheric turbulence. We also show how the modalscattering increases with increasing scintillation and we discuss the impact ofthe scale at which entanglement dissipates due to atmospheric turbulence onfree-space quantum communication.

Observing the decay of orbital angular momentum entanglement, through experimentally simulated turbulence