Long-range adiabatic quantum state transfer through a linear array of quantum dots

TL;DR

This paper proposes a method for long-range quantum state transfer using an array of quantum dots, employing adiabatic variation of gate voltages to achieve coherent electron transfer with analysis of system parameters and imperfections.

Contribution

It introduces a novel adiabatic quantum communication protocol in quantum dot arrays, analyzing its efficiency and robustness against imperfections.

Findings

Effective adiabatic transfer achieved with suitable gate pulses

Transfer time depends on system parameters and energy gap

Robustness demonstrated against fabrication imperfections

Abstract

We introduce an adiabatic long-range quantum communication proposal based on a quantum dot array. By adiabatically varying the external gate voltage applied on the system, the quantum information encoded in the electron can be transported from one end dot to another. We numerically solve the Schr\"odinger equation for a system with a given number of quantum dots. It is shown that this scheme is a simple and efficient protocol to coherently manipulate the population transfer under suitable gate pulses. The dependence of the energy gap and the transfer time on system parameters is analyzed and shown numerically. We also investigate the adiabatic passage in a more realistic system in the presence of inevitable fabrication imperfections. This method provides guidance for future realizations of adiabatic quantum state transfer in experiments.