# Robust manipulation of electron spin coherence in an ensemble of singly charged quantum dots

## TL;DR

This paper demonstrates robust control of electron spin coherence in (In,Ga)As quantum dots using mode locking, enabling manipulation of spin precession and phase inversion up to 25 K, with potential applications in quantum information processing.

## Contribution

It introduces a method to achieve highly robust electron spin coherence control in quantum dot ensembles via mode locking, including phase flipping techniques.

## Key findings

- Controlled electron spin precession up to 25 K
- Phase inversion of spin precession demonstrated
- Adjustable quantum beat bursts in Faraday rotation

## Abstract

Using the recently reported mode locking effect we demonstrate a highly robust control of electron spin coherence in an ensemble of (In,Ga)As quantum dots during the single spin coherence time. The spin precession in a transverse magnetic field can be fully controlled up to 25 K by the parameters of the exciting pulsed laser protocol such as the pulse train sequence, leading to adjustable quantum beat bursts in Faraday rotation. Flipping of the electron spin precession phase was demonstrated by inverting the polarization within a pulse doublet sequence.