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

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.

11 pages, 7 figures, supplementary material is located after the bibliography

References in corpus (4)

• Nanophotonic quantum phase switch with a single atom
• Spin relaxation and anticrossing in quantum dots: Rashba versus Dresselhaus spin-orbit coupling
• Tuning of the spin-orbit interaction in a quantum dot by an in-plane magnetic field
• Spin and tunneling dynamics in an asymmetrical double quantum dot with spin - orbit coupling