  We design an ingenious spintronic quantum eraser to quantitatively probe the
two-electron entanglement. It is shown that the concurrence of two
spin-entangled electrons is directly given by the Aharonov-Bohm oscillation
amplitude of the Fano factor, a measurable current-current correlation, making
it rather promising to experimentally quantify the two-electron entanglement.
The singlet and triplet entangled states are distinguished by the opposite
signs in the Fano factor. Since the main building blocks in the designed setup,
an electronic Mach-Zehnder interferometer and a spin filter, have already been
implemented, our proposal is particularly pertinent to experiments.
