Generating spin-entangled electron pairs in normal conductors using voltage pulses

TL;DR

This paper proposes a method to generate spin-entangled electron pairs in a normal-metal structure using voltage pulses, with entanglement verified via Bell inequality tests based on electron spin measurements.

Contribution

It introduces a novel scheme employing voltage pulses and a fork geometry to produce and detect spin-entangled electron pairs in normal conductors.

Findings

Voltage pulses with flux quantum generate entangled electron pairs.

Entanglement verified through Bell inequality tests.

Post-selection in the fork branches enables entanglement creation.

Abstract

We suggest an operating scheme for the deliberate generation of spin-entangled electron pairs in a normal-metal mesoscopic structure with fork geometry. Voltage pulses with associated Faraday flux equal to one flux unit $\Phi_0=hc/e$ drive individual singlet-pairs of electrons towards the beam splitter. The spin-entangled pair is created through a post-selection in the two branches of the fork. We analyze the appearance of entanglement in a Bell inequality test formulated in terms of the number of transmitted electrons with a given spin polarization.