Scalable native multi-qubit gates for fluxonium architectures with tunable plasmon interactions

• URL: http://arxiv.org/abs/2507.18984v1
• Date: Fri, 25 Jul 2025 06:28:19 GMT
• Title: Scalable native multi-qubit gates for fluxonium architectures with tunable plasmon interactions
• Abstract summary: We show that fluxonium architectures with plasmon interactions have the capability to implement scalable multi-qubit gates.<n>These results underscore the potential of the fluxonium architecture for scalable quantum computation through fast, high-fidelity native multi-qubit gates.
• Score: 11.249296416158769
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Fluxoniums have emerged as a compelling qubit modality for superconducting quantum computing, owing to their strong anharmonicity and high coherence. However, it remains to be seen whether the implementation of high-fidelity entangling gates in a scalable manner will be achieved or not for fluxoniums. Here, we show that fluxonium architectures with tunable plasmon interactions have the capability to implement scalable multi-qubit gates natively while remaining compatible with existing single- and two-qubit gate realizations. Within the architecture, even though qubit states are decoupled, engineered interactions in noncomputational manifolds can facilitate the realization of $(C^{\otimes N})Z$ gates (for $N\geq 2$). This is accomplished by driving qubit-state selective transitions into noncomputational manifolds. Our case studies show that CCZ, CCCZ, and CCCCZ gates with errors of approximately 0.01 (0.001) are achievable, with gate lengths of $50\,(100)\,\text{ns}$, $100\,(250)\,\text{ns}$, and $150\,(300)\,\text{ns}$, respectively. These results underscore the potential of the fluxonium architecture for scalable quantum computation through fast, high-fidelity native multi-qubit gates.

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