Robust and fast microwave-driven quantum logic for trapped-ion qubits

• URL: http://arxiv.org/abs/2402.12955v3
• Date: Fri, 19 Jul 2024 08:52:34 GMT
• Title: Robust and fast microwave-driven quantum logic for trapped-ion qubits
• Authors: M. A. Weber, M. F. Gely, R. K. Hanley, T. P. Harty, A. D. Leu, C. M. Löschnauer, D. P. Nadlinger, D. M. Lucas,
• Abstract summary: Microwave-driven logic is a promising alternative to laser control in scaling trapped-ion based quantum processors. We implement Molmer-Sorensen two-qubit gates on $43textCa+$ hyperfine clock qubits in a cryogenic surface trap, driven by near-field microwaves.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Microwave-driven logic is a promising alternative to laser control in scaling trapped-ion based quantum processors. However, such electronic gates have yet to match the speed offered by their laser-driven counterparts. Here, we implement M{\o}lmer-S{\o}rensen two-qubit gates on $^{43}\text{Ca}^+$ hyperfine clock qubits in a cryogenic ($\approx25~\text{K}$) surface trap, driven by near-field microwaves. We achieve gate durations of $154~\mu\text{s}$ (with $1.0(2)\%$ error) and $331~\mu\text{s}$ ($0.5(1)\%$ error), which approaches the performance of typical laser-driven gates. In the $331~\mu\text{s}$ gate, we demonstrate a new Walsh-modulated dynamical decoupling scheme which suppresses errors due to fluctuations in the qubit frequency as well as imperfections in the decoupling drive itself.

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