Robust Two-Qubit Geometric Phase Gates using Amplitude and Frequency Ramping

TL;DR

This paper introduces a robust method for entangling trapped ions using adiabatic ramping of forces and frequencies, achieving high fidelity without ground-state cooling, suitable for scalable quantum computing.

Contribution

The authors develop a novel adiabatic ramping technique that enhances robustness and reduces calibration needs in ion-based entanglement operations.

Findings

Bell state fidelity above 0.99 achieved

Operates effectively with motional occupations up to 10 phonons

Robust against motional mode drifts

Abstract

We demonstrate a method for generating entanglement between trapped atomic ions based on adiabatically ramped state-dependent forces. By ramping both the amplitude of the state-dependent force and the motional mode frequencies, we realize an entangling operation that is robust to motional mode occupation and drifts in the mode frequencies. We measure Bell state fidelities above 0.99 across a broad range of ramp parameters and with motional occupations up to 10 phonons. This technique enables high-fidelity entangling operations without ground-state cooling, has a reduced calibration overhead, and is well suited for both quantum logic spectroscopy applications and scalable quantum computing architectures.