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We demonstrate high efficiency Cooper pair splitting in a graphene-baseddevice. We utilize a true Y-shape design effectively placing the splittingchannels closer together: graphene is used as the central superconductingelectrode as well as QD output channels, unlike previous designs where aconventional superconductor was used with tunnel barriers to the quantum dots(QD) of a different material. Superconductivity in graphene is induced via theproximity effect, thus resulting in both a large measured superconducting gap$\Delta=0.5$meV, and a long coherence length $\xi=200$nm. Thegraphene-graphene, flat, two dimensional, superconductor-QD interface lowersthe capacitance of the quantum dots, thus increasing the charging energy $E_C$(in contrast to previous devices). As a result we measure a visibility of up to96% and a splitting efficiency of up to 62%. Finally, the devices utilizegraphene grown by chemical vapor deposition allowing for a standardized devicedesign with potential for increased complexity.

High Efficiency CVD Graphene-lead (Pb) Cooper Pair Splitter