Efficient electron transfer in quantum dot chains controlled by a cubic detuning profile via shortcuts to adiabaticity

TL;DR

This paper demonstrates a method for rapid, high-fidelity electron transfer in quantum dot chains using nonlinear electric field pulses and shortcuts to adiabaticity, enhancing scalability of quantum electronic devices.

Contribution

It introduces a nonlinear cubic detuning profile combined with shortcuts to adiabaticity for efficient electron shuttling in quantum dot chains, improving speed and robustness.

Findings

High-fidelity electron transfer achieved with tailored electric pulses

Robustness against spin-flip interactions and inhomogeneities demonstrated

Transfer speed and fidelity controllable via pulse parameters

Abstract

Long-distance fast and precise transfer of charge in semiconductor nanostructures is one of the goals for scalable electronic devices. We study theoretically the control of shuttling of an electron along a linear chain of semiconductor electrostatically-defined quantum dots by an electric field pulse with nonlinear time-dependent profile. We show that this essential nonlinearity along with shortcuts to adiabaticity techniques speed up the electron transfer with high fidelity, while still holding great robustness under spin-flip interactions and inhomogeneities in the couplings of the chain. A given fidelity can be set experimentally by controlling the maximum sweep energy and duration of the control pulse