Transmon qubit using Sn as a junction superconductor
Fuente:
arXiv
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| Autores principales: | , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866918115790553088 |
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| author | Purkayastha, Amrita Sharma, Amritesh Patel, Param J. Chen, An-Hsi Dempsey, Connor P. Asodekar, Shreyas Sinha, Subhayan Tomasian, Maxime Pendharkar, Mihir Palmstrøm, Christopher J. Hocevar, Moïra Zuo, Kun Hatridge, Michael Frolov, Sergey M. |
| author_facet | Purkayastha, Amrita Sharma, Amritesh Patel, Param J. Chen, An-Hsi Dempsey, Connor P. Asodekar, Shreyas Sinha, Subhayan Tomasian, Maxime Pendharkar, Mihir Palmstrøm, Christopher J. Hocevar, Moïra Zuo, Kun Hatridge, Michael Frolov, Sergey M. |
| contents | Superconductor qubits typically use aluminum-aluminum oxide tunnel junctions to provide the non-linear inductance. Junctions with semiconductor barriers make it possible to vary the superconductor material and explore beyond aluminum. We use InAs semiconductor nanowires coated with thin superconducting shells of beta-Sn to realize transmon qubits. By tuning the Josephson energy with a gate voltage, we adjust the qubit frequency over a range of 3 GHz. The longest energy relaxation time, T1 = 27 microseconds, is obtained at the lowest qubit frequencies, while the longest echo dephasing time, T2 = 1.8 microseconds, is achieved at higher frequencies. We assess the possible factors limiting coherence times in these devices and discuss steps to enhance performance through improvements in materials fabrication and circuit design. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_04007 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Transmon qubit using Sn as a junction superconductor Purkayastha, Amrita Sharma, Amritesh Patel, Param J. Chen, An-Hsi Dempsey, Connor P. Asodekar, Shreyas Sinha, Subhayan Tomasian, Maxime Pendharkar, Mihir Palmstrøm, Christopher J. Hocevar, Moïra Zuo, Kun Hatridge, Michael Frolov, Sergey M. Mesoscale and Nanoscale Physics Superconductivity Quantum Physics Superconductor qubits typically use aluminum-aluminum oxide tunnel junctions to provide the non-linear inductance. Junctions with semiconductor barriers make it possible to vary the superconductor material and explore beyond aluminum. We use InAs semiconductor nanowires coated with thin superconducting shells of beta-Sn to realize transmon qubits. By tuning the Josephson energy with a gate voltage, we adjust the qubit frequency over a range of 3 GHz. The longest energy relaxation time, T1 = 27 microseconds, is obtained at the lowest qubit frequencies, while the longest echo dephasing time, T2 = 1.8 microseconds, is achieved at higher frequencies. We assess the possible factors limiting coherence times in these devices and discuss steps to enhance performance through improvements in materials fabrication and circuit design. |
| title | Transmon qubit using Sn as a junction superconductor |
| topic | Mesoscale and Nanoscale Physics Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2508.04007 |