# Phase Control of Trapped Ion Quantum Gates

**Authors:** P J Lee, K-A Brickman, L Deslauriers, P C Haljan, L-M Duan, C Monroe  
**arXiv:** [quant-ph/0505203](https://arxiv.org/abs/quant-ph/0505203)  
**Date:** 2005-05-27  
**Summary page:** https://www.summarizepaper.com/en/arxiv-id/quant-ph--0505203v1/

## Key points

- Paper explores schemes for entangling trapped ion quantum bits
- Schemes rely on interaction between ions and external optical fields
- Main focus is investigating sensitivity of motional gate schemes to phase fluctuations
- Phase fluctuations can lead to undesirable effects such as phase decoherence
- Authors propose techniques to suppress phase decoherence
- Research identifies potential sources of noise and strategies to mitigate their effects
- Aims to enhance understanding of how external control fields affect trapped ion quantum gates
- Findings have implications for development and implementation of large-scale quantum computing architectures based on trapped ions

## Summary

The paper titled "Phase Control of Trapped Ion Quantum Gates" explores various schemes for entangling trapped ion quantum bits in order to facilitate large-scale quantum computation. These schemes primarily rely on the interaction between the ions and external optical fields, which couple the internal qubit states of trapped ions to their Coulomb-coupled motion. The main focus of this study is to investigate the sensitivity of these motional gate schemes to phase fluctuations that may be introduced through noisy external control fields. The presence of such phase fluctuations can lead to undesirable effects, such as phase decoherence, which can significantly impact the reliability and accuracy of quantum gates. To address this issue, the authors propose techniques to suppress the resulting phase decoherence. By analyzing the sensitivity of these motional gate schemes to phase fluctuations, they identify potential sources of noise and develop strategies to mitigate their effects. This research aims to enhance our understanding of how external control fields affect trapped ion quantum gates and provides valuable insights into methods for improving their performance. Overall, this paper contributes to the field of quantum computation by highlighting the importance of controlling and minimizing phase fluctuations in trapped ion systems. The findings presented here have implications for the development and implementation of large-scale quantum computing architectures based on trapped ions.