  We theoretically study tunneling of Cooper pairs from an s-wave
superconductor into two semiconductor quantum wires with strong spin-orbit
interaction under magnetic field, which approximate helical Luttinger liquids.
The entanglement of electrons within a Cooper pair can be detected by the
electric current cross correlations in the wires. By controlling the relative
orientation of the wires, either lithographically or mechanically, on the
substrate, the current correlations can be tuned, as dictated by the initial
spin entanglement. This proposal of a spin-to-charge readout of quantum
correlations is alternative to a recently proposed utilization of the quantum
spin Hall insulator.
