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We report free-space distribution of entangled photon pairs over a noisyground atmosphere of 13km. It is shown that the desired entanglement can stillsurvive after the two entangled photons have passed through the noisy groundatmosphere. This is confirmed by observing a space-like separated violation ofBell inequality of $2.45 \pm 0.09$. On this basis, we exploit the distributedentangled photon source to demonstrate the BB84 quantum cryptography scheme.The distribution distance of entangled photon pairs achieved in the experimentis for the first time well beyond the effective thickness of the aerosphere,hence presenting a significant step towards satellite-based global quantumcommunication.Comment: 4 pages, 3 figure

Experimental Free-Space Distribution of Entangled Photon Pairs Over 13 km: Towards Satellite-Based Global Quantum Communication