Rapid and robust spin state amplification

TL;DR

This paper demonstrates a method to rapidly and reliably amplify a spin state using a lattice of ancillary spins, enhancing measurement capabilities in quantum technology applications.

Contribution

It introduces a simple, scalable model employing an Ising-coupled spin lattice for robust spin state amplification at finite temperature and under decoherence.

Findings

Effective amplification at finite temperature

Robust operation despite decoherence

Applicable in 1D, 2D, and 3D systems

Abstract

Electron and nuclear spins have been employed in many of the early demonstrations of quantum technology (QT). However applications in real world QT are limited by the difficulty of measuring single spins. Here we show that it is possible to rapidly and robustly amplify a spin state using a lattice of ancillary spins. The model we employ corresponds to an extremely simple experimental system: a homogenous Ising-coupled spin lattice in one, two or three dimensions, driven by a continuous microwave field. We establish that the process can operate at finite temperature (imperfect initial polarisation) and under the effects of various forms of decoherence.