Correlating decoherence in transmon qubits: low frequency noise by single fluctuators

Schlör, S., Lisenfeld, J., Müller, C., Bilmes, A., Schneider, A., Pappas, D. P., Ustinov, A. V. and Weides, M. (2019) Correlating decoherence in transmon qubits: low frequency noise by single fluctuators. Physical Review Letters, 123(19), 190502. (doi: 10.1103/PhysRevLett.123.190502)

Abstract

We report on long-term measurements of a highly coherent, nontunable superconducting transmon qubit, revealing low-frequency burst noise in coherence times and qubit transition frequency. We achieve this through a simultaneous measurement of the qubit’s relaxation and dephasing rate as well as its resonance frequency. The analysis of correlations between these parameters yields information about the microscopic origin of the intrinsic decoherence mechanisms in Josephson qubits. Our results are consistent with a small number of microscopic two-level systems located at the edges of the superconducting film, which is further confirmed by a spectral noise analysis.

• Item Type: Articles
• Additional Information: The authors gratefully acknowledge support by the ERC Grant No. 648011, by DFG projects INST 121384/138-1 FUGG, WE 4359-7, and LI2446/1 (J. L.), the Swiss National Science Foundation through NCCR QSIT (C. M.), the Helmholtz International Research School for Teratronics (S. S.), the Carl-ZeissFoundation (A. S.), the National University of Science and Technology MISIS (Contract No. K2-2017-081), the NIST Quantum Information Initiative, ARO, IARPA, and DOE.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Weides, Professor Martin
• Authors: Schlör, S., Lisenfeld, J., Müller, C., Bilmes, A., Schneider, A., Pappas, D. P., Ustinov, A. V., and Weides, M.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114
• Copyright Holders: Copyright © 2019 American Physical Society
• First Published: First published in Physical Review Letters 123(19): 190502
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

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