# Pulsed Dynamical Decoupling for Fast and Robust Two-Qubit Gates on Trapped Ions

## TL;DR

This paper introduces a pulsed dynamical decoupling protocol for fast, tunable, and robust two-qubit gates in trapped ions, leveraging vibrational modes and microwave control to enhance speed and fidelity.

## Contribution

The proposed scheme achieves significantly increased gate speeds and robustness against noise by utilizing vibrational modes and microwave-driven pulses in trapped ion systems.

## Key findings

- Gate fidelities above 99.9% predicted
- Operation times in tens of microseconds
- Robust against magnetic, microwave, and motional noise

## Abstract

We propose a pulsed dynamical decoupling protocol as the generator of tunable, fast, and robust quantum phase gates between two microwave-driven trapped ion hyperfine qubits. The protocol consists of sequences of $\pi$-pulses acting on ions that are oriented along an externally applied magnetic field gradient. In contrast to existing approaches, in our design the two vibrational modes of the ion chain cooperate under the influence of the external microwave driving to achieve significantly increased gate speeds. Our scheme is robust against the dominant noise sources, which are errors on the magnetic field and microwave pulse intensities, as well as motional heating, predicting two-qubit gates with fidelities above $99.9\%$ in tens of microseconds.