  We propose a setup to generate non-local spin-EPR pairs via pair collisions
in a 2D interacting electron gas, based on constructive two-particle
interference in the spin singlet channel at the pi/2 scattering angle. We
calculate the scattering amplitude via the Bethe-Salpeter equation in the
ladder approximation and small r_s limit, and find that the Fermi sea leads to
a substantial renormalization of the bare scattering process. From the
scattering length we estimate the current of spin-entangled electrons and show
that it is within experimental reach.
