Field-resilient superconducting coplanar waveguide resonators made of Nb, NbTi, and NbTiN
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909805790101504 |
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| author | Kim, Bongkeon Yu, Chang Geun Mal, Priyanath Doh, Yong-Joo |
| author_facet | Kim, Bongkeon Yu, Chang Geun Mal, Priyanath Doh, Yong-Joo |
| contents | Superconducting coplanar waveguide (SCPW) resonators with high internal quality factors (\Q_i) are essential for quantum information applications, but suffer severe Qi degradation under magnetic fields due to quasiparticle generation and vortex-induced losses. We fabricated and characterized Nb, NbTi, and NbTiN SCPW resonators with varying film thicknesses under different temperatures and in-plane magnetic fields (\(B_{\parallel}\)). Temperature-dependent transmission measurements agree well with Mattis-Bardeen theory, revealing kinetic inductance parameters. Comparative analysis shows that 45-nm-thick NbTi resonators maintain \(Q_i = 1.01 \times 10^{4}\) at (\(B_{\parallel}\)) = 0.4 T, satisfying the dual requirements of high Qi and strong field resilience. Owing to its moderate kinetic inductance and compatibility with conventional photolithography, NbTi emerges as a practical material platform for field-resilient SCPW resonators and hybrid quantum circuits operating in magnetic environments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_20782 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Field-resilient superconducting coplanar waveguide resonators made of Nb, NbTi, and NbTiN Kim, Bongkeon Yu, Chang Geun Mal, Priyanath Doh, Yong-Joo Superconductivity Superconducting coplanar waveguide (SCPW) resonators with high internal quality factors (\Q_i) are essential for quantum information applications, but suffer severe Qi degradation under magnetic fields due to quasiparticle generation and vortex-induced losses. We fabricated and characterized Nb, NbTi, and NbTiN SCPW resonators with varying film thicknesses under different temperatures and in-plane magnetic fields (\(B_{\parallel}\)). Temperature-dependent transmission measurements agree well with Mattis-Bardeen theory, revealing kinetic inductance parameters. Comparative analysis shows that 45-nm-thick NbTi resonators maintain \(Q_i = 1.01 \times 10^{4}\) at (\(B_{\parallel}\)) = 0.4 T, satisfying the dual requirements of high Qi and strong field resilience. Owing to its moderate kinetic inductance and compatibility with conventional photolithography, NbTi emerges as a practical material platform for field-resilient SCPW resonators and hybrid quantum circuits operating in magnetic environments. |
| title | Field-resilient superconducting coplanar waveguide resonators made of Nb, NbTi, and NbTiN |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2509.20782 |