Enhanced Tantalum Superconducting Resonator Performance via All-Surface Organic Monolayer Passivation
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866915953134010368 |
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| author | Gupta, Harsh Singer, Moritz Schoof, Benedikt Cattani-Scholz, Anna Sharma, Shreya Rommeis, Luca Tornow, Marc |
| author_facet | Gupta, Harsh Singer, Moritz Schoof, Benedikt Cattani-Scholz, Anna Sharma, Shreya Rommeis, Luca Tornow, Marc |
| contents | Tantalum is a promising platform for superconducting quantum circuits, yet coherence times remain limited by dielectric losses from interfacial two-level systems (TLS), exacerbated by native oxide regrowth. Here, we implement molecular surface passivation using self-assembled organic monolayers on freshly etched tantalum and silicon in coplanar waveguide resonators. Surface characterization by contact angle, XPS, FTIR and TEM confirm the formation of ordered, nanometer-thick films that suppress oxide formation. Microwave measurements in the ~5-9 GHz range reveal internal quality factors up to 1.8x10^6 in the single-photon regime at 100 mK, representing a ~140% improvement over untreated devices with native oxide. Power and temperature dependent measurements attribute this enhancement to reduced TLS-induced losses. These results demonstrate that molecular passivation effectively engineers low-loss interfaces and provides a scalable route toward high-coherence superconducting quantum devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_22112 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Enhanced Tantalum Superconducting Resonator Performance via All-Surface Organic Monolayer Passivation Gupta, Harsh Singer, Moritz Schoof, Benedikt Cattani-Scholz, Anna Sharma, Shreya Rommeis, Luca Tornow, Marc Materials Science Applied Physics Quantum Physics Tantalum is a promising platform for superconducting quantum circuits, yet coherence times remain limited by dielectric losses from interfacial two-level systems (TLS), exacerbated by native oxide regrowth. Here, we implement molecular surface passivation using self-assembled organic monolayers on freshly etched tantalum and silicon in coplanar waveguide resonators. Surface characterization by contact angle, XPS, FTIR and TEM confirm the formation of ordered, nanometer-thick films that suppress oxide formation. Microwave measurements in the ~5-9 GHz range reveal internal quality factors up to 1.8x10^6 in the single-photon regime at 100 mK, representing a ~140% improvement over untreated devices with native oxide. Power and temperature dependent measurements attribute this enhancement to reduced TLS-induced losses. These results demonstrate that molecular passivation effectively engineers low-loss interfaces and provides a scalable route toward high-coherence superconducting quantum devices. |
| title | Enhanced Tantalum Superconducting Resonator Performance via All-Surface Organic Monolayer Passivation |
| topic | Materials Science Applied Physics Quantum Physics |
| url | https://arxiv.org/abs/2604.22112 |