Unitary limit in crossed Andreev transport

Landau Institute for Theoretical Physics, RASProsp. Akad. Semenova 1-A, 142432 Chernogolovka, Moscow region, Russia(Dated: January 26, 2015)Crossed Andreev reection (CAR) in which Cooper pair splits into two spin- and energy entangledelectrons that leave a superconductor through respective spatially separated leads is one of the mostpromising approaches to generating pairs of entangled electrons. However, while the conventional(local) Andreev reection occurs with the probability of unity, the probability of CAR is signi cantlysuppressed. Here we propose a hybrid normal metal-superconductor setup that enables achieving aunitary limit of cross Andreev transport, i.e. CAR with the probability of unity thus o ering theoutcome of the entangled electrons with the 100% eciency.