Fast adiabatic-like spin manipulation in a two-electron double quantum dot

TL;DR

This paper demonstrates a method to rapidly manipulate electron spins in a double quantum dot using transitionless quantum driving, enabling fast, adiabatic-like control with simplified electric field configurations.

Contribution

It introduces a novel application of transitionless quantum driving to achieve fast spin control in double quantum dots with simplified electric field requirements.

Findings

Achieved nanosecond-scale adiabatic-like spin manipulation.

Designed electric field protocols for fast control.

Simplified the setup by transforming the Hamiltonian.

Abstract

We apply the transitionless quantum driving method to control the electron spin of a two-electron double quantum dot with spin-orbit coupling by time-dependent electric fields. The $x$ and $y$ components of applied electric fields in each dot are designed to achieve fast adiabatic-like passage in the nanosecond timescale. To simplify the setup, we can further transform Hamiltonian by z axis to design an alternative speed-up adiabatic passage, without using the applied electric field in $y$ direction.