# Trapped-Ion Quantum Computing: Progress and Challenges

## TL;DR

This paper reviews the current state, progress, and challenges of trapped-ion quantum computing, highlighting recent achievements, limitations, and future directions for scaling and improving ion-based quantum systems.

## Contribution

It provides a comprehensive overview of trapped-ion QC, including recent advancements, challenges in scaling, and potential solutions for error mitigation and system design.

## Key findings

- Universal QC demonstrated with few-ion systems
- Progress in increasing ion trap scale and reducing errors
- Outlook for near-term applications and future system design

## Abstract

Trapped ions are among the most promising systems for practical quantum computing (QC). The basic requirements for universal QC have all been demonstrated with ions and quantum algorithms using few-ion-qubit systems have been implemented. We review the state of the field, covering the basics of how trapped ions are used for QC and their strengths and limitations as qubits. In addition, we discuss what is being done, and what may be required, to increase the scale of trapped ion quantum computers while mitigating decoherence and control errors. Finally, we explore the outlook for trapped-ion QC. In particular, we discuss near-term applications, considerations impacting the design of future systems of trapped ions, and experiments and demonstrations that may further inform these considerations.