Supercurrent tuning of the Josephson coupling energy
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arXiv
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917292996034560 |
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| author | Wisne, Maxwell Chandrasekhar, Venkat |
| author_facet | Wisne, Maxwell Chandrasekhar, Venkat |
| contents | The ability to non-dissipatively tune the Josephson coupling energy of Josephson junctions is a useful tool in frequency-tunable qubits. This is typically done by threading magnetic flux through two junctions connected in a loop, a geometry that exposes the qubit to magnetic environmental noise. In this paper, we show that by biasing a junction with supercurrent from a separate pair of superconducting leads coupled to the device, the Josephson energy can be tuned without the need for a flux loop. Our multiterminal device may enable the realization of a frequency-tunable qubit with greatly reduced susceptibility to flux noise. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_14357 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Supercurrent tuning of the Josephson coupling energy Wisne, Maxwell Chandrasekhar, Venkat Mesoscale and Nanoscale Physics The ability to non-dissipatively tune the Josephson coupling energy of Josephson junctions is a useful tool in frequency-tunable qubits. This is typically done by threading magnetic flux through two junctions connected in a loop, a geometry that exposes the qubit to magnetic environmental noise. In this paper, we show that by biasing a junction with supercurrent from a separate pair of superconducting leads coupled to the device, the Josephson energy can be tuned without the need for a flux loop. Our multiterminal device may enable the realization of a frequency-tunable qubit with greatly reduced susceptibility to flux noise. |
| title | Supercurrent tuning of the Josephson coupling energy |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2507.14357 |