Noise correlations in a flux qubit with tunable tunnel coupling
Name
Gustavsson-2011-Noise correlations in a flux qubit with tunable.pdf
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Author(s)
Yoshihara, Fumiki
Nakamura, Yasunobu
Gustavsson, Simon
Bylander, Jonas
Yan, Fei
Oliver, William D.
Date Issued
July 2011
Journal
Physical Review B
Publisher
American Physical Society
Citation
Gustavsson, Simon et al. “Noise correlations in a flux qubit with tunable tunnel coupling.” Physical Review B 84 (2011): n. pag. Web. 17 Nov. 2011. © 2011 American Physical Society
Version
Final published version
Abstract
We have measured flux-noise correlations in a tunable superconducting flux qubit. The device consists of two loops that independently control the qubit’s energy splitting and tunnel coupling. Low-frequency flux noise in the loops causes fluctuations of the qubit frequency and leads to dephasing. Since the noises in the two loops couple to different terms of the qubit Hamiltonian, a measurement of the dephasing rate at different bias points provides a way to extract both the amplitude and the sign of the noise correlations. We find that the flux fluctuations in the two loops are anticorrelated, consistent with a model where the flux noise is generated by randomly oriented unpaired spins on the metal surface.
MIT Department
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.84.014525
