Generating spin-entangled electron pairs in normal conductors using voltage pulses

Abstract

We suggest an operating scheme for the deliberate generation of spin-entangled electron pairs in a normal-metal mesoscopic structure with fork geometry. Voltage pulses with associated Faraday flux equal to one flux unit ${\ensuremath{\Phi}}_{0}=hc∕e$ drive individual singlet pairs of electrons toward the beam splitter. The spin-entangled pair is created through a post-selection in the two branches of the fork. We analyze the appearance of entanglement in a Bell inequality test formulated in terms of the number of transmitted electrons with a given spin polarization.