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The coherent control of mesoscopic ensembles of atoms and Rydberg atomblockade are the basis for proposed quantum devices such as integrable gatesand single photon sources. So far, experimental progress has been limited tocomplex experimental setups that use ultracold atoms. Here, we show thatcoherence times of ~100ns are achievable with coherent Rydberg atomspectroscopy in um sized thermal vapor cells. We investigated states withprinciple quantum numbers between 30 and 50. Our results demonstrate thatmicrocells with a size on the order of the blockade radius, ~2um, attemperatures of 100-300C are robust, promising candidates to investigate lowdimensional strongly interacting Rydberg gases, construct quantum gates andbuild single photon sources.

Coherent Excitation of Rydberg Atoms in Thermal Vapor Microcells