Optical Read-Out and Initialization of an Electron Spin in a Single Quantum Dot

TL;DR

This paper presents a theoretical study of optical methods for reading out and initializing a single electron spin in a quantum dot using resonant excitation and polarized light, proposing feasible protocols for spin control.

Contribution

It introduces a theoretical framework for optical read-out and initialization of electron spins in quantum dots, combining resonant excitation with magnetic fields for effective spin manipulation.

Findings

Feasible protocols for spin initialization using optical pumping and magnetic fields.

Theoretical demonstration of spin read-out via a recycling transition.

Analysis of resonant optical excitation of a trion in quantum dots.

Abstract

We describe theoretically the resonant optical excitation of a trion with circularly polarized light and discuss how this trion permits the read-out of a single electron spin through a recycling transition. Optical pumping through combination of circularly polarized optical $\pi$--pulses with permanent or $\pi$-- pulsed transverse magnetic fields suggests feasible protocols for spin initialization.