High quality superconducting tantalum resonators with beta phase defects
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| Autores principales: | , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2025
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| author | Dhundhwal, Ritika Duan, Haoran Brauch, Lucas Arabi, Soroush Fuchs, Dirk Haghighirad, Amir-Abbas Welle, Alexander Scharwaechter, Florentine Pal, Sudip Scheffler, Marc Palomo, José Leghtas, Zaki Murani, Anil Hahn, Horst Aghassi-Hagmann, Jasmin Kübel, Christian Wulfhekel, Wulf Pop, Ioan M. Reisinger, Thomas |
| author_facet | Dhundhwal, Ritika Duan, Haoran Brauch, Lucas Arabi, Soroush Fuchs, Dirk Haghighirad, Amir-Abbas Welle, Alexander Scharwaechter, Florentine Pal, Sudip Scheffler, Marc Palomo, José Leghtas, Zaki Murani, Anil Hahn, Horst Aghassi-Hagmann, Jasmin Kübel, Christian Wulfhekel, Wulf Pop, Ioan M. Reisinger, Thomas |
| contents | For practical superconducting quantum processors, orders of magnitude improvement in coherence is required, motivating efforts to optimize hardware design and explore new materials. Among the latter, the coherence of superconducting transmon qubits has been shown to improve by forming the qubit capacitor pads from $α$-tantalum, avoiding the meta-stable $β$-phase that forms when depositing tantalum at room temperature, and has been previously identified to be a source of microwave losses. In this work, we show lumped element resonators containing $β$-phase tantalum in the form of inclusions near the metal-substrate interface with internal quality factors ($Q_\text{i}$) up to $(5.0 \pm 2.5) \times 10^6$ in the single photon regime. They outperform resonators with no sign of the $β$-phase in x-ray diffraction and thermal quasi-particle loss. Our results indicate that small concentrations of $β$-phase can be beneficial, enhancing critical magnetic fields and potentially, for improving coherence in tantalum based superconducting circuits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_17247 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High quality superconducting tantalum resonators with beta phase defects Dhundhwal, Ritika Duan, Haoran Brauch, Lucas Arabi, Soroush Fuchs, Dirk Haghighirad, Amir-Abbas Welle, Alexander Scharwaechter, Florentine Pal, Sudip Scheffler, Marc Palomo, José Leghtas, Zaki Murani, Anil Hahn, Horst Aghassi-Hagmann, Jasmin Kübel, Christian Wulfhekel, Wulf Pop, Ioan M. Reisinger, Thomas Quantum Physics Materials Science Superconductivity For practical superconducting quantum processors, orders of magnitude improvement in coherence is required, motivating efforts to optimize hardware design and explore new materials. Among the latter, the coherence of superconducting transmon qubits has been shown to improve by forming the qubit capacitor pads from $α$-tantalum, avoiding the meta-stable $β$-phase that forms when depositing tantalum at room temperature, and has been previously identified to be a source of microwave losses. In this work, we show lumped element resonators containing $β$-phase tantalum in the form of inclusions near the metal-substrate interface with internal quality factors ($Q_\text{i}$) up to $(5.0 \pm 2.5) \times 10^6$ in the single photon regime. They outperform resonators with no sign of the $β$-phase in x-ray diffraction and thermal quasi-particle loss. Our results indicate that small concentrations of $β$-phase can be beneficial, enhancing critical magnetic fields and potentially, for improving coherence in tantalum based superconducting circuits. |
| title | High quality superconducting tantalum resonators with beta phase defects |
| topic | Quantum Physics Materials Science Superconductivity |
| url | https://arxiv.org/abs/2502.17247 |