Tunable anharmonicity in Sn-InAs nanowire transmons beyond the short junction limit
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2026
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866917364845510656 |
|---|---|
| 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 | The anharmonicity of a transmon qubit, defined as the difference in energy level spacing, is a key design parameter. In transmons built from hybrid superconductor-semiconductor Josephson elements, the anharmonicity is tunable with gate voltages that control both the Josephson energy and the weak link transparency. In Sn-InAs nanowire transmons, we use two-tone microwave spectroscopy to extract anharmonicity ranging in absolute value from the transmon charging energy $E_c$ to values smaller than $E_c/10$. This behavior contrasts with the predictions of the multi-channel short-junction model, which sets a lower limit on anharmonicity at $E_c/4$. Coherent operation of the qubit is still possible at the point of the lowest anharmonicity. These findings demonstrate the potential of quantum circuits that benefit from widely electrically tunable anharmonicity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_26895 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Tunable anharmonicity in Sn-InAs nanowire transmons beyond the short junction limit 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 The anharmonicity of a transmon qubit, defined as the difference in energy level spacing, is a key design parameter. In transmons built from hybrid superconductor-semiconductor Josephson elements, the anharmonicity is tunable with gate voltages that control both the Josephson energy and the weak link transparency. In Sn-InAs nanowire transmons, we use two-tone microwave spectroscopy to extract anharmonicity ranging in absolute value from the transmon charging energy $E_c$ to values smaller than $E_c/10$. This behavior contrasts with the predictions of the multi-channel short-junction model, which sets a lower limit on anharmonicity at $E_c/4$. Coherent operation of the qubit is still possible at the point of the lowest anharmonicity. These findings demonstrate the potential of quantum circuits that benefit from widely electrically tunable anharmonicity. |
| title | Tunable anharmonicity in Sn-InAs nanowire transmons beyond the short junction limit |
| topic | Mesoscale and Nanoscale Physics Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2603.26895 |