Hybrid solid state qubits: the powerful role of electron spins

TL;DR

This review discusses how hybrid solid-state qubits combining electron spins with other quantum systems enable long coherence times, fast operations, and scalable entanglement, advancing practical quantum technologies.

Contribution

It provides a comprehensive overview of hybrid electron spin qubits, highlighting their advantages and potential for scalable quantum computing in solid-state systems.

Findings

Electron spins can coherently store quantum information for over seconds.

Hybrid qubits enable fast manipulation and measurement.

Scalable entanglement methods for spatially separated qubits are feasible.

Abstract

We review progress on the use of electron spins to store and process quantum information, with particular focus on the ability of the electron spin to interact with multiple quantum degrees of freedom. We examine the benefits of hybrid quantum bits (qubits) in the solid state that are based on coupling electron spins to nuclear spin, electron charge, optical photons, and superconducting qubits. These benefits include the coherent storage of qubits for times exceeding seconds, fast qubit manipulation, single qubit measurement, and scalable methods for entangling spatially separated matter-based qubits. In this way, the key strengths of different physical qubit implementations are brought together, laying the foundation for practical solid-state quantum technologies.