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We present the experimental demonstration of interaction induced enhancementin Rydberg excitation or Rydberg anti-blockade in thermal atomic vapor. We haveused optical heterodyne detection technique to measure Rydberg population dueto two-photon excitation to the Rydberg state. The anti-blockade peak whichdoesn't satisfy the two-photon resonant condition is observed along with theusual two-photon resonant peak which can't be explained using the model withnon-interacting three-level atomic system. A model involving two interactingatoms is formulated for thermal atomic vapor using the dressed states ofthree-level atomic system to explain the experimental observations. Anon-linear dependence of vapor density is observed for the anti-blockade peakwhich also increases with increase in principal quantum number of the Rydbergstate. A good agreement is found between the experimental observations and theproposed interacting model. Our result implies possible applications towardsquantum logic gates using Rydberg anti-blockade in thermal atomic vapor.

Rydberg interaction induced enhanced excitation in thermal atomic vapor