Violation of Bellʹs inequality in electronic Mach–Zehnder interferometers

We propose a possible setup of testing the Bellʹs inequality in mesoscopic conductors. The particular implementation uses two coupled electronic Mach–Zehnder interferometers in which electrons are injected into the conductors in the quantum Hall regime. It is shown that the Bellʹs inequality is violated for an arbitrary coupling strength between the two interferometers.