Single vanadium ion magnetic dopant in an individual CdTe/ZnTe quantum dot

TL;DR

This paper reports the creation and characterization of a novel quantum system where a single V2+ ion is embedded in a CdTe/ZnTe quantum dot, demonstrating potential as a localized qubit for quantum computing.

Contribution

It introduces a new physical system with a single vanadium ion in a quantum dot, combining experimental realization and theoretical modeling to understand its properties.

Findings

Observation of excitonic line splitting due to vanadium interaction

Confirmation of the system through polarization-resolved magneto-photoluminescence

Identification of the vanadium spin as a potential qubit

Abstract

We present the basic properties of a new physical system: an individual V2+ ion embedded into an individual quantum dot. The system is realized utilizing molecular beam epitaxy and it is observed using a low-temperature polarization-resolved magneto-photoluminescence. The nature of the system is confirmed by observation of the excitonic lines split due to the interactions of a vanadium ion with carriers confined in a CdTe/ZnTe quantum dot. Observed data are explained by the numerical modeling which includes s,p-d exchange interaction, Zeeman splitting of the exciton and the ion, diamagnetic shift, and the presence of shear strain within the quantum dot. The fundamental state of vanadium exhibits a spin +/- 1/2 making this system a textbook localized qubit.