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arXiv · 2505.24303

NbTiN Nanowire Resonators for Spin-Photon Coupling on Solid Neon

Y. Tian·I. Grytsenko·A. Jennings·J. Wang·H. Ikegami·X. Zhou·S. Tamate·H. Terai·H. Kutsuma·D. Jin·M. Benito·E. Kawakami
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Abstract

Electrons floating on a solid neon exhibit long charge coherence times, making them attractive for hybrid quantum systems. When combined with high-quality, high-impedance superconducting resonators and a local magnetic field gradient, this platform enables strong charge--photon and spin--charge coupling-key ingredients for scalable spin qubit architectures. In this work, we demonstrate that NbTiN nanowire resonators maintain high quality factors around 10^5 after depositing solid neon onto the resonators and subsequently loading electrons onto the neon surface, validating their suitability for electrons-on-neon platforms. Building on these experimental results, we theoretically analyze micromagnet designs and coupling strategies that can enable spin-photon interactions in this platform. Our analysis outlines performance targets for next-generation devices, showing that, at the charge sweet spot, spin qubit gate fidelities exceeding 99.99% for single-qubit operations and 99.9% for two-qubit operations are achievable with natural neon.

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Y. Tian, I. Grytsenko, A. Jennings, J. Wang, H. Ikegami, X. Zhou, S. Tamate, H. Terai, H. Kutsuma, D. Jin, M. Benito, E. Kawakami. 2025-10-17. NbTiN Nanowire Resonators for Spin-Photon Coupling on Solid Neon. https://doi.org/10.1103/jq9v-n4rn

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