Fast optical preparation, control and read-out of single quantum dot spin

TL;DR

This paper demonstrates rapid optical methods for initializing, controlling, and reading out a single quantum dot spin, advancing quantum information processing capabilities.

Contribution

It introduces a sequential optical protocol for spin manipulation in quantum dots, including initialization, coherent control, and read-out, with experimental validation.

Findings

Successful optical initialization of a single hole spin.

Observation of coherent Rabi oscillations between hole and exciton states.

Spin-selective photocurrent read-out of the quantum dot spin.

Abstract

We propose and demonstrate the sequential initialization, optical control, and read-out of a single spin trapped in a semiconductor quantum dot. Hole spin preparation is achieved through ionization of a resonantly excited electron-hole pair. Optical control is observed as a coherent Rabi rotation between the hole and charged exciton states, which is conditional on the initial hole spin state. The spin-selective creation of the charged exciton provides a photocurrent read-out of the hole spin state.