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Noise correlations in a flux qubit with tunable tunnel coupling

Author(s)
Yoshihara, Fumiki; Nakamura, Yasunobu; Gustavsson, Simon; Bylander, Jonas; Yan, Fei; Oliver, William D.; ... Show more Show less
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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.
Date issued
2011-07
URI
http://hdl.handle.net/1721.1/67056
Department
Lincoln Laboratory; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Research Laboratory of Electronics
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
ISSN
1098-0121
1550-235X

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