Hybrid Microwave Radiation Patterns for High-Fidelity Quantum Gates with Trapped Ions

TL;DR

This paper introduces a hybrid microwave radiation scheme combining continuous and pulsed patterns to implement high-fidelity, robust entangling gates in trapped ion quantum computing, resilient to common experimental noise sources.

Contribution

The authors develop a novel hybrid microwave control protocol that enhances gate fidelity and robustness in trapped ion systems, accommodating low microwave power scenarios.

Findings

Achieves high-fidelity entangling gates resilient to magnetic field fluctuations.

Demonstrates robustness against microwave amplitude variations and crosstalk.

Effective under realistic decoherence conditions through numerical simulations.

Abstract

We present a method that combines continuous and pulsed microwave radiation patterns to achieve robust interactions among hyperfine trapped ions placed in a magnetic field gradient. More specifically, our scheme displays continuous microwave drivings with modulated phases, phase flips, and $\pi$ pulses. This leads to high-fidelity entangling gates which are resilient against magnetic field fluctuations, changes on the microwave amplitudes, and crosstalk effects. Our protocol runs with arbitrary values of microwave power, which includes the technologically relevant case of low microwave intensities. We demonstrate the performance of our method with detailed numerical simulations that take into account the main sources of decoherence.