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We explore a single-photon approach to Rydberg state excitation and Rydbergblockade. Using detailed theoretical models, we show the feasibility of directexcitation, predict the effect of background electric fields, and calculate therequired interatomic distance to observe Rydberg blockade. We then measure andcontrol the electric field environment to enable coherent control of Rydbergstates. With this coherent control, we demonstrate Rydberg blockade of twoatoms separated by 6.6(3) {\mu}m. When compared with the more common two-photonexcitation method, this single-photon approach is advantageous because iteliminates channels for decoherence through photon scattering and AC Starkshifts from the intermediate state while moderately increasing Dopplersensitivity.

Two-Atom Rydberg Blockade using Direct 6S to nP Excitation