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Rydberg atoms are ideal tools for quantum technologies. Due to their largesize, their dipole-dipole interaction at micrometer-scale distances and theircoupling to external fields are huge. Recent experiments vividly exhibit theirinterest for quantum simulation, in spite of limitations due to the relativelyshort lifetime of optically-accessible Rydberg levels. These limitationsmotivate a renewed interest for the long-lived circular Rydberg states .However, detecting them is so far either destructive or complex. Moreover,alkali circular states can be manipulated only by microwave fields, unable toaddress individual atoms. Alkaline earth circular states, with their opticallyactive second valence electron, can circumvent these problems. Here we show howto use the electrostatic coupling between the two valence electrons ofstrontium to coherently manipulate a circular Rydberg state with opticalpulses. We also use this coupling to map the state of the Rydberg electron ontothat of the ionic core. This experiment opens the way to a state-selectivespatially-resolved non-destructive detection of the circular states and,beyond, to the realization of a hybrid optical-microwave platform for quantumtechnology.

Optical coherent manipulation of alkaline-earth circular Rydberg states