Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session S48: Superconducting Qubits: Quasiparticles
8:00 AM–10:36 AM,
Thursday, March 7, 2024
Room: 200E
Sponsoring
Units:
DQI DCMP DMP
Chair: Jaseung Ku, Syracuse University
Abstract: S48.00012 : High-frequency flux noise from quasiparticles*
10:12 AM–10:24 AM
Presenter:
Jose Alberto Nava Aquino
(University of Victoria)
Authors:
Jose Alberto Nava Aquino
(University of Victoria)
Rogério de Sousa
(University of Victoria)
We describe a mechanism of flux noise that originates from the presence of quasiparticles in the superconducting wires, and predict the resulting frequency and temperature dependence. Under the assumption of thermal equilibrium for the quasiparticles, flux noise is shown to originate from Johnson-Nyquist fluctuations due to the quasiparticle surface resistance [4]. At low frequencies, the latter is much lower than the typical residual resistance observed in experiments, thus leading to white flux noise. However, at higher frequencies ħω » kBT the thermal quasiparticles generate Ohmic flux noise (∝ω). We discuss the impact of a nonequilibrium distribution of quasiparticles and compare our results to experiments available to date.
[1] T. Lanting et Al, Phys. Rev. B 83, 180502(R) (2011).
[2] C. M. Quintana et Al, Phys. Rev. Lett.118, 057702(R) (2017).
[3] J. A. Nava Aquino and R. de Sousa, Phys. Rev. B 106, 144506 (2022).
[4] D. C. Mattis and J. Bardeen, Phys. Rev. 111, 412 (1958).
*This work was supported by NSERC (Canada) through its Discovery program (Grant No. RGPIN-2020-04328).
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