Spin qubits in antidot lattices

TL;DR

This paper proposes using designed defects in antidot lattices within a two-dimensional electron gas to create localized states suitable for quantum computing, enabling coherent electron transport and controllable spin interactions.

Contribution

It introduces a novel approach to quantum information processing by utilizing defect states in antidot lattices for scalable quantum computing architectures.

Findings

Localized defect states appear in antidot lattices with designed defects.

Defect states enable coherent electron transport between distant sites.

Electrostatically controllable exchange coupling is possible between electron spins.

Abstract

We suggest and study designed defects in an otherwise periodic potential modulation of a two-dimensional electron gas as an alternative approach to electron spin based quantum information processing in the solid-state using conventional gate-defined quantum dots. We calculate the band structure and density of states for a periodic potential modulation, referred to as an antidot lattice, and find that localized states appear, when designed defects are introduced in the lattice. Such defect states may form the building blocks for quantum computing in a large antidot lattice, allowing for coherent electron transport between distant defect states in the lattice and tunnel coupling of neighboring defect states with corresponding electrostatically controllable exchange coupling between different electron spins.