Tunneling transfer protocol in a quantum dot chain immune to inhomogeneity

TL;DR

This paper introduces a quantum dot chain protocol for high-fidelity quantum state transfer that is robust against inhomogeneity, using a simple global electric field for operation.

Contribution

It presents a novel tunneling transfer protocol in a quantum dot chain that is largely immune to inhomogeneity and does not require local control of individual dots.

Findings

Supports high-fidelity state transfer via free evolution and adiabatic methods

Insensitive to inhomogeneity in quantum dot energy parameters

Requires only a global electric field for operation

Abstract

We propose a quantum dot (QD) implementation of a quantum state transfer channel. The proposed channel consists of N vertically stacked QDs with the nearest neighbor tunnel coupling, placed in an axial electric field. We show that the system supports high-fidelity transfer of the state of a terminal dot both by free evolution and by adiabatic transfer. The protocol is to a large extent insensitive to inhomogeneity of the energy parameters of the dots and requires only a global electric field.