Spin-Based Quantum Computers made by Chemistry: Hows and Whys

Abstract

This introductory review discusses the main problems facing the attempt to build quantum information processing systems (like quantum computers) from spin-based qubits. We emphasize 'bottom-up' attempts using methods from chemistry. The essentials of quantum computing are explained, along with a description of the qubits and their interactions in terms of physical spin qubits. The main problem to be overcome is decoherence - how this works is described, along with ways to suppress contributions from spin bath and oscillator bath environments, and from dipolar interactions. Finally we discuss various strategies for making chemistry-based spin qubits, using both magnetic molecules and magnetic ions.

13 pages, 10 figures

References in corpus (6)

• Spin qubits with electrically gated polyoxometalate molecules
• The low-$T$ phase diagram of $\mathrm{LiH}{\mathrm{o}}_{\mathrm{x}}{\mathrm{Y}}_{1-\mathrm{x}}{\mathrm{F}}_4$
• Nuclear spin dynamics in the quantum regime of a single-molecule magnet
• Decoherence by Correlated Noise and Quantum Error Correction
• Coherent manipulation of electron spins up to ambient temperatures in Cr${}^{5+}$(S=1/2) doped K${}_3$NbO${}_8$
• Dynamics and thermalization of the nuclear spin bath in the single-molecule magnet Mn12-ac: test for the theory of spin tunneling