Transport signatures of phase fluctuations in superconducting qubits

Wisne, M.; Deng, Y.; Cansizoglu, H.; Kopas, C.; Mutus, J. Y.; Chandrasekhar, V.

doi:10.1088/2633-4356/ad9a47

Title: Transport signatures of phase fluctuations in superconducting qubits

Journal Article · 12 December 2024 · Materials for Quantum Technology

DOI: https://doi.org/10.1088/2633-4356/ad9a47 · OSTI ID:2481133

;

; Cansizoglu, H.;

; Mutus, J. Y.; Chandrasekhar, V.

Abstract 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.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 2481133

Journal Information:: Materials for Quantum Technology, Journal Name: Materials for Quantum Technology Journal Issue: 4 Vol. 4; ISSN 2633-4356

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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