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

• DOI: 10.48550/arxiv.2407.07694
• Publication Date: 2024-01-01
• Authors: Löschnauer, C. M.; Toba, J. Mosca; Hughes, A. C.; King, S. A.; Weber, M. A.; Srinivas, R.; Matt, R.; Nourshargh, R.; Allcock, D. T. C.; Ballance, C. J.; Matthiesen, C.; Malinowski, M.; Harty, T. P.
• Keywords: Quantum Physics; Atomic Physics (physics.atom-ph); FOS: Physical sciences; Quantum Physics (quant-ph); Physics - Atomic Physics

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.