Robust entanglement gates for trapped-ion qubits

TL;DR

This paper introduces a family of robust two-qubit entangling gates for trapped-ion qubits, enhancing fidelity by reducing sensitivity to noise and control errors through multi-tone drives, and demonstrates their effectiveness experimentally.

Contribution

The authors propose and experimentally validate a new class of noise-resilient entangling gates based on multi-tone drives, generalizing the Mølmer-Sørensen gate.

Findings

Gates are robust against control errors and noise.

Experimental implementation on Sr+ ions confirms resilience.

Enhanced fidelity potential for quantum computing applications.

Abstract

High-fidelity two-qubit entangling gates play an important role in many quantum information processing tasks and are a necessary building block for constructing a universal quantum computer. Such high-fidelity gates have been demonstrated on trapped-ion qubits, however, control errors and noise in gate parameters may still lead to reduced fidelity. Here we propose and demonstrate a general family of two-qubit entangling gates which are robust to different sources of noise and control errors. These gates generalize the celebrated M{\o}lmer-S{\o}rensen gate by using multi-tone drives. We experimentally implemented several of the proposed gates on $^{88}\text{Sr}^{+}$ ions trapped in a linear Paul trap, and verified their resilience.