1/f noise of Josephson-junction-embedded microwave resonators at single photon energies and millikelvin temperatures

We present measurements of 1/f frequency noise in both linear and Josephson-junction-embedded superconducting aluminum resonators in the low power, low temperature regime-typical operating conditions for superconducting qubits. The addition of the Josephson junction does not result in additional fre...

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Bibliographic Details
Published in:Applied physics letters 2012-04, Vol.100 (14), p.142601-142601-3
Main Authors: Murch, K. W., Weber, S. J., Levenson-Falk, E. M., Vijay, R., Siddiqi, I.
Format: Article
Language:English
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Summary:We present measurements of 1/f frequency noise in both linear and Josephson-junction-embedded superconducting aluminum resonators in the low power, low temperature regime-typical operating conditions for superconducting qubits. The addition of the Josephson junction does not result in additional frequency noise, thereby placing an upper limit for fractional critical current fluctuations of 1 × 10 − 8 ( 1 / Hz ) at 1Hz for sub-micron, shadow evaporated junctions. These values imply a minimum dephasing time for a superconducting qubit due to critical current noise of 40-1400 μ s depending on qubit architecture. Occasionally, at temperatures above 50mK, we observe the activation of individual fluctuators which increase the level of noise significantly and exhibit Lorentzian spectra.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3700964