Optical control and decoherence of spin qubits in quantum dots

TL;DR

This paper explores all-optical methods for controlling and manipulating spin qubits in semiconductor quantum dots, including spin rotation, polarization control, and the impact of phonon-induced decoherence on protocol fidelity.

Contribution

It introduces novel optical techniques for spin control in quantum dots and analyzes phonon effects on the coherence of these protocols.

Findings

Optical spin rotation achieved via coupling to trion states

Polarization of excitons can be controlled through two-photon transitions

Phonon interactions significantly affect control fidelity

Abstract

We discuss various methods of all-optical spin control in semiconductor quantum dots. We present different ways of rotating a single confined electron spin by optical coupling to a trion state. We also discuss a method for controlling the polarization of a confined exciton via a two-photon transition. Finally, we analyze the effect of phonon-induced decoherence on the fidelity of these optical spin control protocols.