Two-particle nonlocal Aharonov-Bohm effect from two single-particle emitters

Phys Rev Lett. 2009 Aug 14;103(7):076804. doi: 10.1103/PhysRevLett.103.076804. Epub 2009 Aug 13.

Abstract

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.