Entanglement of Electrons Field-Emitted from a Superconductor

TL;DR

This paper investigates how electrons emitted from a superconductor can be entangled and violate Bell's inequality, highlighting the quantum correlations arising from Cooper pairs and their experimental implications.

Contribution

It demonstrates that field-emitted electrons from a superconductor can exhibit entanglement and Bell inequality violation, linking bosonic Cooper pairs to fermionic electrons.

Findings

Electrons emitted in opposite directions violate Bell's inequality.

Analysis of nonlocal correlations in superconductor electron emission.

Feasibility discussed in context of current experimental capabilities.

Abstract

Under appropriate circumstances the electrons emitted from a superconducting tip can be entangled. We analyze these nonlocal correlations by studying the coincidences of the field-emitted electrons and show that electrons emitted in opposite directions violate Bell's inequality. We scrutinize the interplay between the bosonic nature of Cooper pairs and the fermionic nature of electrons. We further discuss the feasibility of our analysis in the light of present experimental capabilities.