Selective optical manipulation of the spin state of a single magnetic impurity in a semiconductor quantum dot

TL;DR

This paper demonstrates how resonant optical pumping can selectively manipulate the spin states of a single magnetic impurity, such as Mn, in a quantum dot, highlighting potential for quantum computing applications.

Contribution

It introduces a method for selective spin state control of a magnetic impurity in a quantum dot using resonant optical techniques, differing from mechanisms in diluted semiconductors.

Findings

Resonant optical pumping can selectively address impurity spin states.

Anisotropic exchange interactions enable optical polarization of the impurity.

Mn impurity can serve as a qubit with manipulation limited by exchange interactions and temperature.

Abstract

We consider the optical properties of a single magnetic impurity in a self-assembled quantum dot. We show that using the resonant pumping one can address and manipulate selectively individual spin states of a magnetic impurity. The mechanisms of resonant optical polarization of a single impurity in a quantum dot involve anisotropic exchange interactions and are different to those in diluted semiconductors. A Mn impurity can act as qubit. The limiting factors for the qubit manipulation are the electron-hole exchange interaction and finite temperature.