Nonadiabatic Electron Manipulation in Quantum-Dot Arrays

TL;DR

This paper introduces a new nonadiabatic control method for electron tunneling in quantum-dot arrays using quantum interference, enabling precise electron manipulation with smooth gate voltages suitable for realistic quantum-dot systems.

Contribution

It presents a systematic design of smooth gate pulses for arbitrary electron state manipulation in quantum-dots, advancing control techniques without abrupt voltage switching.

Findings

Successful numerical simulations of complete electron transfer in double quantum-dots.

Analytic formula for designing smooth gate pulses.

Estimation shows the method's feasibility in realistic quantum-dot systems.

Abstract

A novel method of coherent manipulation of the electron tunneling in quantum-dots is proposed, which utilizes the quantum interference in nonadiabatic double-crossing of the discrete energy levels. In this method, we need only a smoothly varying gate voltage to manipulate electrons, without a sudden switching-on and off. A systematic design of a smooth gate-pulse is presented with a simple analytic formula to drive the two-level electronic state to essentially arbitrary target state, and numerical simulations for complete transfer of an electron is shown for a coupled double quantum-dots and an array of quantum-dots. Estimation of the manipulation-time shows that the present method can be employed in realistic quantum-dots.