Optimal laser-control of double quantum dots

TL;DR

This paper demonstrates how optimal laser pulses can precisely control electron states in double quantum dots, achieving high fidelity and enabling fast, robust charge switching within terahertz frequency ranges.

Contribution

It introduces a method using optimal-control theory to design laser pulses for high-fidelity electron control in double quantum dots, surpassing conventional approaches.

Findings

Optimized picosecond laser pulses achieve >0.99 fidelity in population transfer.

A robust, fast charge switch is designed using optimal pulses.

Control is feasible within terahertz laser technology capabilities.

Abstract

Coherent single-electron control in a realistic semiconductor double quantum dot is studied theoretically. Using optimal-control theory we show that the energy spectrum of a two-dimensional double quantum dot has a fully controllable transition line. We find that optimized picosecond laser pulses generate population transfer at significantly higher fidelities (>0.99) than conventional sinusoidal pulses. Finally we design a robust and fast charge switch driven by optimal pulses that are within reach of terahertz laser technology.