Entanglement witnesses from single-particle interference
T. Scholak, F. Mintert, C. A. Müller · Europhysics Letters (EPL) · 2008
We describe a general method of realizing entanglement witnesses in terms of the interference pattern of a single quantum probe. After outlining the principle, we discuss specific realizations both with electrons in mesoscopic Aharonov-Bohm rings and with photons in standard Young's double-slit or coherent-backscattering interferometers.