Entangling nuclear spins in distant quantum dots via an electron bus

TL;DR

This paper introduces a protocol to generate entanglement between nuclear spins in distant quantum dots using polarized electrons and electron transfer, confirmed through simulations and analyzed for experimental feasibility.

Contribution

The paper presents a novel deterministic entanglement protocol for nuclear spins in distant quantum dots utilizing electron transfer and polarization.

Findings

Protocol successfully produces entanglement in simulations.

Effective models confirm entanglement for various system inhomogeneities.

Feasibility analysis suggests potential for experimental implementation.

Abstract

We propose a protocol for the deterministic generation of entanglement between two ensembles of nuclear spins surrounding two distant quantum dots. The protocol relies on the injection of electrons with definite polarization in each quantum dot and the coherent transfer of electrons from one quantum dot to the other. Computing the exact dynamics for small systems, and using an effective master equation and approximate non-linear equations of motion for larger systems, we are able to confirm that our protocol indeed produces entanglement for both homogeneous and inhomogeneous systems. Last, we analyze the feasibility of our protocol in several current experimental platforms.