Origin and Reduction of 1/f Magnetic Flux Noise in Superconducting Devices
P. Kumar, S. Sendelbach, M. A. Beck, J. W. Freeland, Zhe Wang, Hui Wang, Clare C. Yu, R. Q. Wu, D. P. Pappas, R. McDermott
DOI 10.1103/PhysRevApplied.6.041001 · Physical Review Applied
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
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/fα, with α≲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 O2 is the dominant contributor to magnetism in superconducting thin films. We show that this magnetism can be reduced 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 of up to a factor of 5. These advances open the door to the realization of superconducting qubits with improved quantum coherence.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Nanoscale Observation and Control of Quasiparticle Induced Magnetic Noise in a Superconducting Resonator
similarity 0.96Senlei Li et al.
Source status unknown — claims are unverified
Investigation of the dB/dH effect using trapped flux in type-II superconductors
similarity 0.95M. A. R. LeBlanc et al.
Source status unknown — claims are unverified
Temperature Square Dependence of the Low Frequency 1/f Charge Noise in the Josephson Junction Qubits
similarity 0.95O. Astafiev et al.
Source status unknown — claims are unverified
Efficiency of quasiparticle evacuation in superconducting devices
similarity 0.95Sukumar Rajauria et al.
Source status unknown — claims are unverified
Suppression of Cooper-pair tunneling in superconducting charge boxes in tunable electromagnetic environments
similarity 0.95Watson Kuo et al.
Source status unknown — claims are unverified
Magnetic flux noise in superconducting rings and disks close to the superconducting transition
similarity 0.95S. A. L. Foulds et al.
Source status unknown — claims are unverified