Characterizing electron entanglement in multiterminal mesoscopic conductors

TL;DR

This paper proposes a method to detect and distinguish electron entanglement in multiterminal mesoscopic conductors using current correlations at a beam splitter's exit ports, applicable to various input states.

Contribution

It introduces a scheme to identify and differentiate occupation-number and degree-of-freedom entanglement through current correlation measurements.

Findings

Current correlations can detect electron entanglement.

The scheme works for various input states, including same-port and separated electrons.

It discriminates between different types of entanglement.

Abstract

We show that current correlations at the exit ports of a beam splitter can be used to detect electronic entanglement for a fairly general input state. This includes the situation where electron pairs can enter the beam splitter from the same port or be separated due to backscattering. The proposed scheme allows to discriminate between occupation-number and degree-of-freedom entanglement.