Correlating Decoherence in Transmon Qubits: Low Frequency Noise by Single Fluctuators

Published

November 8, 2019

Author(s)

Steffen Schlor, Jurgen Lisenfeld, Clemens Muller, Alexander Bilmes, Andre Schneider, David P. Pappas, Alexey V. Ustinov, Martin Weides

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.

Citation

Physical Review Letters

Volume

123

Issue

19

Pub Type

Journals

Download Paper

https://doi.org/10.1103/PhysRevLett.123.190502

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Keywords

coherent transmon, low frequency burst noise, coherence times, superconducting transmon qubit, transition frequency, relaxation rate, dephasing rate, resonance frequency, microscopic origin, spectral noise analysis

Citation

Schlor, S. , Lisenfeld, J. , Muller, C. , Bilmes, A. , Schneider, A. , Pappas, D. , Ustinov, A. and Weides, M. (2019), Correlating Decoherence in Transmon Qubits: Low Frequency Noise by Single Fluctuators, Physical Review Letters, [online], https://doi.org/10.1103/PhysRevLett.123.190502, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927940 (Accessed December 2, 2024)