All-optical implementation of a dynamic-decoupling protocol for hole spins in (In,Ga)As quantum dots

TL;DR

This paper demonstrates an all-optical dynamic decoupling protocol that doubles the coherence time of hole spins in (In,Ga)As quantum dots by using a periodic laser-pulse sequence.

Contribution

It introduces a novel all-optical dynamic decoupling method that effectively extends spin coherence times in quantum dots.

Findings

Doubling the laser pulse repetition rate increases spin coherence time by a factor of two.

The protocol effectively decouples hole spins from their surrounding environment.

All-optical control simplifies implementation of quantum coherence preservation.

Abstract

We demonstrate the potential of a periodic laser-pulse protocol for dynamic decoupling of hole spins in (In,Ga)As quantum dots from surrounding baths. When doubling the repetition rate of inversionlaser pulses between two reference pulses for orienting the spins, we find that the spin coherence time is increased by a factor of two.