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arXiv · 2204.11829

Demonstration of the Two-Fluxonium Cross-Resonance Gate

Ebru Dogan·Dario Rosenstock·Loïck Le Guevel·Haonan Xiong·Raymond A. Mencia·Aaron Somoroff·Konstantin N. Nesterov·Maxim G. Vavilov·Vladimir E. Manucharyan·Chen Wang
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Abstract

The superconducting fluxonium qubit has a great potential for high-fidelity quantum gates with its long coherence times and strong anharmonicity at the half flux quantum sweet spot. However, current implementations of two-qubit gates compromise fluxonium's coherence properties by requiring either a temporary population of the non-computational states or tuning the magnetic flux off the sweet spot. Here we realize a fast all-microwave cross-resonance gate between two capacitively-coupled fluxoniums with the qubit dynamics well confined to the computational space. We demonstrate a direct CNOT gate in 70 ns with fidelity up to $\mathcal{F}=0.9949(6)$ despite the limitations of a sub-optimal measurement setup and device coherence. Our results project a possible pathway towards reducing the two-qubit error rate below $10^{-4}$ with present-day technologies.

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Ebru Dogan, Dario Rosenstock, Loïck Le Guevel, Haonan Xiong, Raymond A. Mencia, Aaron Somoroff, Konstantin N. Nesterov, Maxim G. Vavilov, Vladimir E. Manucharyan, Chen Wang. 2022-04-25. Demonstration of the Two-Fluxonium Cross-Resonance Gate. https://arxiv.org/abs/2204.11829

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