Interaction-Resilient Scalable Fluxonium Architecture with All-Microwave Gates

• URL: http://arxiv.org/abs/2512.21189v1
• Date: Wed, 24 Dec 2025 14:15:41 GMT
• Title: Interaction-Resilient Scalable Fluxonium Architecture with All-Microwave Gates
• Authors: Andrei A. Kugut, Grigoriy S. Mazhorin, Ilya A. Simakov,
• Abstract summary: We propose a fluxonium-based square-grid design with fast $sim63$ns controlled-Z (CZ) gates, achieving coherent errors below $10-4$.<n>A central difficulty in large-scale systems with all-microwave gates is suppressing parasitic interactions that extend beyond nearest neighbors.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Fluxonium qubits demonstrate exceptional potential for quantum processing; yet, realizing scalable architectures using them remains challenging. We propose a fluxonium-based square-grid design with fast $\sim63$~ns controlled-Z (CZ) gates, achieving coherent errors below $10^{-4}$, activated via microwave-driven transmon couplers. A central difficulty in such large-scale systems with all-microwave gates and, therefore, strong static couplings, is suppressing parasitic interactions that extend beyond nearest neighbors to include next-nearest elements. We address this issue by introducing several design strategies: the frequency allocation of both qubits and couplers, the localization of coupler wavefunctions, and a differential oscillator that suppresses residual long-range interactions. In addition, the architecture natively supports fast $\sim70$~ns CZZ gates -- three-qubit operations composed of two CZ gates sharing a common qubit -- which reduce the incoherent error by $\sim 35\%$ compared to performing the corresponding CZs sequentially. Together, these advances establish an interaction-resilient platform for large-scale fluxonium processors and can be adapted to a variety of fluxonium layouts.

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