Paper

Scalable, high-fidelity all-electronic control of trapped-ion qubits

Hughes, A C, Löschnauer, C M, Ballance, C J, Allcock, D T C, J Mosca Toba, Harty, T P, Matt, R, Weber, M A, Srinivas, R, Malinowski, M, Nourshargh, R, King, S A, Matthiesen, C

2024

Overview

The central challenge of quantum computing is implementing high-fidelity quantum gates at scale. However, many existing approaches to qubit control suffer from a scale-performance trade-off, impeding progress towards the creation of useful devices. Here, we present a vision for an electronically controlled trapped-ion quantum computer that alleviates this bottleneck. Our architecture utilizes shared current-carrying traces and local tuning electrodes in a microfabricated chip to perform quantum gates with low noise and crosstalk regardless of device size. To verify our approach, we experimentally demonstrate low-noise site-selective single- and two-qubit gates in a seven-zone ion trap that can control up to 10 qubits. We implement electronic single-qubit gates with 99.99916(7)% fidelity, and demonstrate consistent performance with low crosstalk across the device. We also electronically generate two-qubit maximally entangled states with 99.97(1)% fidelity and long-term stable performance over continuous system operation. These state-of-the-art results validate the path to directly scaling these techniques to large-scale quantum computers based on electronically controlled trapped-ion qubits.

• Publisher: Cornell University Library, arXiv.org
• Subject: Accuracy / Crosstalk / Electronic control / Entangled states / Gates / Low noise / Quantum computers / Quantum computing / Quantum entanglement / Qubits (quantum computing)