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



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


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.
Physical Review Letters


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


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],, (Accessed April 12, 2024)
Created November 7, 2019, Updated October 12, 2021