Transport signatures of phase fluctuations in superconducting qubits
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866909427774259200 |
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| author | Wisne, Maxwell Deng, Yanpei Cansizoglu, Hilal Kopas, Cameron Mutus, Josh Chandrasekhar, Venkat |
| author_facet | Wisne, Maxwell Deng, Yanpei Cansizoglu, Hilal Kopas, Cameron Mutus, Josh Chandrasekhar, Venkat |
| contents | Josephson junctions supply the nonlinear inductance element in superconducting qubits. In the widely used transmon configuration, where the junction is shunted by a large capacitor, the low charging energy minimizes the sensitivity of the qubit to charge noise while maintaining the necessary anharmonicity to qubit states. We report here low-frequency transport measurements on small standalone junctions and identically fabricated capacitively-shunted junctions that show two distinct features normally attributed to small capacitance junctions near zero bias: reduced switching currents and prominent finite resistance associated with phase diffusion in the current-voltage characteristic. Our transport data reveals the existence of phase fluctuations in transmons arising from intrinsic junction capacitance. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_19658 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Transport signatures of phase fluctuations in superconducting qubits Wisne, Maxwell Deng, Yanpei Cansizoglu, Hilal Kopas, Cameron Mutus, Josh Chandrasekhar, Venkat Mesoscale and Nanoscale Physics Josephson junctions supply the nonlinear inductance element in superconducting qubits. In the widely used transmon configuration, where the junction is shunted by a large capacitor, the low charging energy minimizes the sensitivity of the qubit to charge noise while maintaining the necessary anharmonicity to qubit states. We report here low-frequency transport measurements on small standalone junctions and identically fabricated capacitively-shunted junctions that show two distinct features normally attributed to small capacitance junctions near zero bias: reduced switching currents and prominent finite resistance associated with phase diffusion in the current-voltage characteristic. Our transport data reveals the existence of phase fluctuations in transmons arising from intrinsic junction capacitance. |
| title | Transport signatures of phase fluctuations in superconducting qubits |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.19658 |