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Three-terminal superconductor (S) - normal metal (N) - superconductor (S)Josephson junctions are investigated. In a geometry where a T-shape normalmetal is connected to three superconducting reservoirs, new sub-gap structuresappear in the differential resistance for specific combinations of thesuperconductor chemical potentials. Those correspond to a correlated motion ofCooper pairs within the device that persist well above the Thouless energy andis consistent with the prediction of quartets formed by two entangled Cooperpairs. A simplified nonequilibrium Keldysh Green's function calculation ispresented that supports this interpretation.

Sub-Gap Structure in the Conductance of a Three-Terminal Josephson Junction