Cavity-induced switching between Bell-state textures in a quantum dot

TL;DR

This paper models how microwave cavities influence spin states in quantum dots, revealing complex polariton states, topological effects, and potential for optical read-out in quantum technologies.

Contribution

It introduces a theoretical framework predicting cavity-induced spin textures, topological effects, and measurable photon signatures in quantum dot systems.

Findings

Emergence of new polariton states with spin and radiation correlations

Detection of topological spin-charge density effects

Photon distribution signatures enabling optical read-out

Abstract

Nanoscale quantum dots in microwave cavities can be used as a laboratory for exploring electron-electron interactions and their spin in the presence of quantized light and a magnetic field. We show how a simple theoretical model of this interplay at resonance predicts complex but measurable effects. New polariton states emerge that combine spin, relative modes, and radiation. These states have intricate spin-space correlations and undergo polariton transitions controlled by the microwave cavity field. We uncover novel topological effects involving highly correlated spin and charge density that display singlet-triplet and inhomogeneous Bell-state distributions. Signatures of these transitions are imprinted in the photon distribution, which will allow for optical read-out protocols in future experiments and nanoscale quantum technologies.