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arXiv · 2511.14364

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

Christina Bowers·Deviprasath Palani·John Barta·Tyler Guglielmo·Stephen Libby·Dietrich Leibfried·Daniel Slichter
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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.

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Christina Bowers, Deviprasath Palani, John Barta, Tyler Guglielmo, Stephen Libby, Dietrich Leibfried, Daniel Slichter. 2025-11-18. Robust Two-Qubit Geometric Phase Gates using Amplitude and Frequency Ramping. https://arxiv.org/abs/2511.14364

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