Optically-controlled single-qubit rotations in self-assembled InAs quantum dots

TL;DR

This paper develops a theoretical method for optically controlling electron spins in InAs quantum dots, enabling high-fidelity single-qubit rotations using Raman-detuned laser pulses within tens of picoseconds.

Contribution

It introduces a novel theoretical framework for achieving arbitrary single-qubit rotations in quantum dots via optical control, accounting for hole-mixing and finite hole g-factors.

Findings

High-fidelity rotations achievable with short laser pulses

Arbitrary single-qubit rotations demonstrated theoretically

Inclusion of hole-mixing effects enhances model accuracy

Abstract

We present a theory of the optical control of the spin of an electron in an InAs quantum dot. We show how two Raman-detuned laser pulses can be used to obtain arbitrary single-qubit rotations via the excitation of an intermediate trion state. Our theory takes into account a finite in-plane hole $g$-factor and hole-mixing. We show that such rotations can be performed to high fidelities with pulses lasting a few tens of picoseconds.