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Crossed Andreev reflection (cAR) is a scattering process that happens in aquantum transport set-up consisting of two normal metals (NM) attached to asuperconductor (SC), where an electron incident from one NM results in a holeemerging in the other. Typically, an electron tunnelling through thesuperconductor from one NM to the other (ET) competes with cAR and masks thesignature of cAR in the conductance spectrum. We propose a novel scheme toenhance cAR, in which SC part of the NM-SC-NM is side-coupled to another SChaving a different SC phase to form a Josephson junction in the transversedirection. At strong enough coupling and adequate phase difference, one cansmoothly traverse between highly ET-dominant to highly cAR-dominant transportregimes by tuning chemical potential, due to the appearance of subgap Andreevstates that are extended in the longitudinal direction. We also discussconnections to realistic systems.

Enhancement of crossed Andreev reflection in a superconducting ladder connected to normal metal leads