Quantum computing and single-qubit measurements using the spin filter effect

TL;DR

This paper proposes a novel method for single-spin measurement in solid-state quantum computing by converting spin magnetization into charge using ferromagnetic tunnel barriers and quantum dots.

Contribution

It introduces a new approach leveraging the spin filter effect for single-spin detection, advancing measurement techniques in solid-state quantum computing.

Findings

Potential for single-spin measurement at the single-Bohr-magneton level

Utilization of ferromagnetic tunnel barriers with quantum dots

Feasibility of converting magnetization into measurable charge

Abstract

Many things will have to go right for quantum computation to become a reality in the lab. For any of the presently-proposed approaches involving spin states in solids, an essential requirement is that these spins should be measured at the single-Bohr-magneton level. Fortunately, quantum computing provides a suggestion for a new approach to this seemingly almost impossible task: convert the magnetization into a charge, and measure the charge. I show how this might be done by exploiting the spin filter effect provided by ferromagnetic tunnel barriers, used in conjunction with one-electron quantum dots.