by E. Urban, ...., T. Walker and M. Saffman
Blockade interactions whereby a single particle prevents the flow or excitation of other particles provide a mechanism for control of quantum states, including entanglement of two or more particles. Blockade has been observed for electrons1, 2, 3, photons4 and cold atoms5. Furthermore, dipolar interactions between highly excited atoms have been proposed as a mechanism for 'Rydberg blockade'6, 7, which might provide a novel approach to a number of quantum protocols8, 9, 10, 11. Dipolar interactions between Rydberg atoms were observed several decades ago1213, 14, 15, 16, 17, 18. However, to harness Rydberg blockade for controlled quantum dynamics, it is necessary to achieve strong interactions between single pairs of atoms. Here, we demonstrate that a single Rydberg-excited rubidium atom blocks excitation of a second atom located more than 10 
m away. The observed probability of double excitation is less than 20%, consistent with a theoretical model of the Rydberg interaction augmented by Monte Carlo simulations that account for experimental imperfections. and have been studied recently in a many-body regime using cold atoms
m away. The observed probability of double excitation is less than 20%, consistent with a theoretical model of the Rydberg interaction augmented by Monte Carlo simulations that account for experimental imperfections. and have been studied recently in a many-body regime using cold atoms
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