Two-particle nonlocal Aharonov-Bohm effect from two single-particle emitters.
We propose a mesoscopic circuit in the quantum Hall effect regime comprising two uncorrelated single-particle sources and two distant Mach-Zehnder interferometers with magnetic fluxes, which allows us in a controllable way to produce orbitally entangled electrons. Two-particle correlations appear as a consequence of erasing of which-path information due to collisions taking place at distant interferometers and in general at different times. The two-particle correlations manifest themselves as an Aharonov-Bohm effect in noise, while the current is insensitive to magnetic fluxes. In an appropriate time interval the concurrence reaches a maximum and a Bell inequality is violated.
Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland.
Janine
J
Splettstoesser
Michael
M
Moskalets
Markus
M
Büttiker