Scalable entangling gates on ion qubits via structured light addressing

• URL: http://arxiv.org/abs/2506.19535v1
• Date: Tue, 24 Jun 2025 11:45:28 GMT
• Title: Scalable entangling gates on ion qubits via structured light addressing
• Authors: Xueying Mai, Liyun Zhang, Qinyang Yu, Junhua Zhang, Yao Lu,
• Abstract summary: A central challenge in developing practical quantum processors is maintaining low control complexity while scaling to large numbers of qubits.<n>We develop a novel trapped-ion processor with an individual-addressing system that generates steerable Hermite-Gaussian beam arrays.<n>We demonstrate addressable two-qubit entangling gates in chains up to six ions with fidelities consistently around 0.97, achieved without complex pulse shaping.
• Score: 3.6205489137572204
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: A central challenge in developing practical quantum processors is maintaining low control complexity while scaling to large numbers of qubits. Trapped-ion systems excel in small-scale operations and support rapid qubit scaling via long-chain architectures. However, their performance in larger systems is hindered by spectral crowding in radial motional modes, a problem that forces reliance on intricate pulse-shaping techniques to maintain gate fidelities. Here, we overcome this challenge by developing a novel trapped-ion processor with an individual-addressing system that generates steerable Hermite-Gaussian beam arrays. The transverse gradient of these beams couples qubits selectively to sparse axial motional modes, enabling to isolate a single mode as entanglement mediator. Leveraging this capability, we demonstrate addressable two-qubit entangling gates in chains up to six ions with fidelities consistently around 0.97, achieved without complex pulse shaping. Our method significantly reduces control overhead while preserving scalability, providing a crucial advance toward practical large-scale trapped-ion quantum computing.

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