Theory of spin qubits in nanostructures

TL;DR

This paper reviews recent theoretical developments in spin qubits within nanostructures, covering material innovations, decoherence mechanisms, control techniques, and alternative coupling methods, highlighting progress and challenges in quantum computing applications.

Contribution

It provides a comprehensive overview of recent theoretical advances in spin qubits, including new material platforms, decoherence analysis, control methods like EDSR, and alternative spin coupling mechanisms.

Findings

Graphene as a promising material for spin qubits

Charge fluctuations induce spin decoherence via spin--orbit coupling

Electron-dipole spin resonance enables single spin rotations

Abstract

We review recent advances on the theory of spin qubits in nanostructures. We focus on four selected topics. First, we show how to form spin qubits in the new and promising material graphene. Afterwards, we discuss spin relaxation and decoherence in quantum dots. In particular, we demonstrate how charge fluctations in the surrounding environment cause spin decay via spin--orbit coupling. We then turn to a brief overview of how one can use electron-dipole spin resonance (EDSR) to perform single spin rotations in quantum dots using an oscillating electric field. The final topic we cover is the spin-spin coupling via spin-orbit interaction which is an alternative to the usual spin-spin coupling via the Heisenberg exchange interaction.