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26 April 2024 |
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Origin and Suppression of $1/f$ Magnetic Flux Noise | | P. Kumar
; S. Sendelbach
; M. A. Beck
; J. W. Freeland
; Zhe Wang
; Hui Wang
; C. C. Yu
; R. Q. Wu
; D. P. Pappas
; R. McDermott
; | | Date: |
4 Apr 2016 | | Abstract: | Magnetic flux noise is a dominant source of dephasing and energy relaxation
in superconducting qubits. The noise power spectral density varies with
frequency as $1/f^alpha$ with $alpha sim 1$ and spans 13 orders of
magnitude. Recent work indicates that the noise is from unpaired magnetic
defects on the surfaces of the superconducting devices. Here, we demonstrate
that adsorbed molecular O$_2$ is the dominant contributor to magnetism in
superconducting thin films. We show that this magnetism can be suppressed by
appropriate surface treatment or improvement in the sample vacuum environment.
We observe a suppression of static spin susceptibility by more than an order of
magnitude and a suppression of $1/f$ magnetic flux noise power spectral density
by more than a factor of 5. These advances open the door to realization of
superconducting qubits with improved quantum coherence. | | Source: | arXiv, 1604.0877 | | Services: | Forum | Review | PDF | Favorites | |
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