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Cooper pair splitting (CPS) can induce non-local correlation between twonormal conductors coupling to a superconductor. CPS into a doubleone-dimensional electron gas is an appropriate platform for extracting largeamount of entangled electron pairs and one of the key ingredients forengineering Majorana Fermions with no magnetic field. Here we study CPS using aJosephson junction of a gate-tunable ballistic InAs double nanowire. Themeasured switching current into the two nanowires significantly larger than sumof that into the respective nanowires, indicating the inter-wiresuperconductivity dominant compared to the intra-wire superconductivity. Fromdependence on the number of propagating channels in the nanowires, the observedCPS is assigned to one-dimensional electron-electron interaction. Our resultswill pave the way for utilizing one-dimensional electron-electron interactionto reveal physics of high-efficient CPS and engineer Majorana Fermions indouble nanowire systems via CPS.

Dominant non-local superconducting proximity effect due to electron-electron interaction in a ballistic double nanowire