Nonlocal Handbury-Brown Twiss Interferometry & Entanglement Generation from Majorana Bound States

TL;DR

This paper demonstrates how a one-dimensional device with Majorana bound states can produce unique interference effects and generate non-local entanglement between electronic spins, with potential applications in quantum information.

Contribution

It introduces a novel interference effect and a method to engineer non-local spin entanglement using Majorana bound states in a one-dimensional device.

Findings

Majorana states cause electron-hole anti-bunching detectable via current correlations.

Scattering of spin-polarized electrons can create non-local spin entanglement.

The phenomena are observable in various physical systems with Majorana modes.

Abstract

We show that a one dimensional device supporting a pair of Majorana bound states at its ends can produce remarkable Hanbury-Brown Twiss like interference effects between well separated Dirac fermions of pertinent energies. We find that the simultaneous scattering of two incoming electrons or two incoming holes from the Majorana bound states leads exclusively to an electron-hole final state. This "anti-bunching" in electron-hole internal pseudospin space can be detected through current-current correlations. Further, we show that, by scattering appropriate spin polarized electrons from the Majorana bound states, one can engineer a non-local entangler of electronic spins for quantum information applications. Both the above phenomena should be observable in diverse physical systems enabling to detect the presence of low energy Majorana modes.