Non-demolishing measurement of a spin qubit state via Fano resonance

TL;DR

This paper proposes a method using Fano resonances to perform non-demolishing measurements of a single electron spin in a quantum dot, leveraging spin-orbit interactions to prevent spin-flip events.

Contribution

It introduces a novel measurement technique utilizing Fano resonances and spin-orbit interactions to achieve non-demolishing spin state detection in quantum dots.

Findings

Fano resonance enables spin state measurement via spin-polarized current.

Spin-orbit interaction prevents spin-flip events during measurement.

The method ensures the measurement process is non-demolishing.

Abstract

Fano resonances are proposed to perform a measurement of a spin state (whether it is up or down) of a single electron in a quantum dot via a spin-polarized current in an adjacent quantum wire. Rashba-like spin-orbit interaction in a quantum dot prohibits spin-flip events (Kondo-like phenomenon). That ensures the measurement to be non-demolishing.