= Rydberg blockade
{c}
<Rydberg blockade> suppresses simultaneous excitation of nearby <chemical atoms> into strongly interacting <Rydberg atom> states. If the interaction shifts the doubly excited level by much more than the excitation linewidth and coherent drive scale, a pulse resonant for one isolated <chemical atom> becomes off-resonant when a neighbour is already excited. The resulting conditional dynamics can implement an entangling <two-qubit gate> for neutral-atom <qubits>.
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