Probing Quantitatively Two-electron Entanglement with a Spintronic Quantum Eraser

W. Chen, R. Shen, Z. D. Wang, L. Sheng, B. G. Wang, D. Y. Xing

Published 2012-07-25Version 1

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.