Transport signatures of phase fluctuations in superconducting qubits
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 anharmo...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | Materials for Quantum Technology |
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| Online Access: | https://doi.org/10.1088/2633-4356/ad9a47 |
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| author | M Wisne Y Deng H Cansizoglu C Kopas J Y Mutus V Chandrasekhar |
| author_facet | M Wisne Y Deng H Cansizoglu C Kopas J Y Mutus V Chandrasekhar |
| author_sort | M Wisne |
| collection | DOAJ |
| description | 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 | Article |
| id | doaj-art-43ffff5232de460b8f352c4dcea232c0 |
| institution | OA Journals |
| issn | 2633-4356 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials for Quantum Technology |
| spelling | doaj-art-43ffff5232de460b8f352c4dcea232c02025-08-20T01:58:49ZengIOP PublishingMaterials for Quantum Technology2633-43562024-01-014404600110.1088/2633-4356/ad9a47Transport signatures of phase fluctuations in superconducting qubitsM Wisne0https://orcid.org/0009-0006-1068-4209Y Deng1https://orcid.org/0009-0004-2223-4120H Cansizoglu2C Kopas3https://orcid.org/0000-0002-6184-2987J Y Mutus4V Chandrasekhar5Department of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, United States of AmericaDepartment of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, United States of AmericaRigetti Computing , Berkeley, CA 94710, United States of AmericaRigetti Computing , Berkeley, CA 94710, United States of AmericaRigetti Computing , Berkeley, CA 94710, United States of AmericaDepartment of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, United States of AmericaJosephson 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.https://doi.org/10.1088/2633-4356/ad9a47Josephson junctionsJosephson phase fluctuationstransmons |
| spellingShingle | M Wisne Y Deng H Cansizoglu C Kopas J Y Mutus V Chandrasekhar Transport signatures of phase fluctuations in superconducting qubits Materials for Quantum Technology Josephson junctions Josephson phase fluctuations transmons |
| title | Transport signatures of phase fluctuations in superconducting qubits |
| title_full | Transport signatures of phase fluctuations in superconducting qubits |
| title_fullStr | Transport signatures of phase fluctuations in superconducting qubits |
| title_full_unstemmed | Transport signatures of phase fluctuations in superconducting qubits |
| title_short | Transport signatures of phase fluctuations in superconducting qubits |
| title_sort | transport signatures of phase fluctuations in superconducting qubits |
| topic | Josephson junctions Josephson phase fluctuations transmons |
| url | https://doi.org/10.1088/2633-4356/ad9a47 |
| work_keys_str_mv | AT mwisne transportsignaturesofphasefluctuationsinsuperconductingqubits AT ydeng transportsignaturesofphasefluctuationsinsuperconductingqubits AT hcansizoglu transportsignaturesofphasefluctuationsinsuperconductingqubits AT ckopas transportsignaturesofphasefluctuationsinsuperconductingqubits AT jymutus transportsignaturesofphasefluctuationsinsuperconductingqubits AT vchandrasekhar transportsignaturesofphasefluctuationsinsuperconductingqubits |