Composite M{\o}lmer-S{\o}rensen gate

TL;DR

This paper introduces a robust, high-fidelity composite M{46}lmer-S{46}rensen gate for ion trap quantum computing, addressing common errors and improving gate performance.

Contribution

It proposes an amplitude-modulated composite MS gate that enhances robustness against errors and detuning issues, advancing ion trap quantum gate fidelity.

Findings

Achieves high fidelity despite timing and detuning errors

Tolerant to a.c. Stark shifts and drifting detuning

Improves robustness of two-qubit ion trap gates

Abstract

The M{\o}lmer-S{\o}rensen (MS) gate is a two-qubit controlled-phase gate in ion traps that is highly valued due to its ability to preserve the motional state of the ions. However, its fidelity is obstructed by errors affecting the motion of the ions as well as the rotation of the qubits. In this work, we propose an amplitude-modulated composite MS gate which features high fidelity robust to gate timing, detuning and coupling errors and is also tolerant of a.c. Stark shifts and drifting detuning errors.