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Trapped Ion Quantum Computing Superconducting Qubits

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

arXiv
Authors: K. W. Murch, S. J. Weber, E. M. Levenson-Falk, R. Vijay, I. Siddiqi

Year

2011

Paper ID

29185

Status

Preprint

Abstract Read

~2 min

Abstract Words

109

Citations

N/A

Abstract

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 10-8 Hz$-1/2$ at 1 Hz 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 μs depending on qubit architecture. Occasionally, at temperatures above 50 mK, we observe the activation of individual fluctuators which increase the level of noise significantly and exhibit Lorentzian spectra.

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  • 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 -...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1112.3584 [2] arXiv https://arxiv.org/abs/1112.3584 [3] Publisher https://arxiv.org/abs/1112.3584

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