Prospects for Spin-Based Quantum Computing

TL;DR

This paper reviews recent progress in spin-based quantum computing, highlighting how decoherence challenges are diminishing and discussing various quantum dot systems, their opportunities, and remaining challenges.

Contribution

It provides a comprehensive overview of experimental and theoretical advances in spin-based quantum computing with quantum dots, emphasizing new insights into decoherence and system opportunities.

Findings

Decoherence is less of a barrier than previously thought.

Various quantum dot systems show promising progress.

Theoretical proposals and experimental suggestions are discussed.

Abstract

Experimental and theoretical progress toward quantum computation with spins in quantum dots (QDs) is reviewed, with particular focus on QDs formed in GaAs heterostructures, on nanowire-based QDs, and on self-assembled QDs. We report on a remarkable evolution of the field where decoherence, one of the main challenges for realizing quantum computers, no longer seems to be the stumbling block it had originally been considered. General concepts, relevant quantities, and basic requirements for spin-based quantum computing are explained; opportunities and challenges of spin-orbit interaction and nuclear spins are reviewed. We discuss recent achievements, present current theoretical proposals, and make several suggestions for further experiments.