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Condensed Matter > Superconductivity

arXiv:2006.05171 (cond-mat)
[Submitted on 9 Jun 2020 (v1), last revised 11 Jun 2020 (this version, v2)]

Title:Superconducting granular aluminum resonators resilient to magnetic fields up to 1 Tesla

Authors:K. Borisov, D. Rieger, P. Winkel, F. Henriques, F. Valenti, A. Ionita, M. Wessbecher, M. Spiecker, D. Gusenkova, I. M. Pop, W. Wernsdorfer
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Abstract:High kinetic inductance materials constitute a valuable resource for superconducting quantum circuits and hybrid architectures. Superconducting granular aluminum (grAl) reaches kinetic sheet inductances in the nH/$\square$ range, with proven applicability in superconducting quantum bits and microwave detectors. Here we show that the single photon internal quality factor $Q_{\mathrm{i}}$ of grAl microwave resonators exceeds $10^5$ in magnetic fields up to 1T, aligned in-plane to the grAl films. Small perpendicular magnetic fields, in the range of 0.5mT, enhance $Q_{\mathrm{i}}$ by approximately 15%, possibly due to the introduction of quasiparticle traps in the form of fluxons. Further increasing the perpendicular field deteriorates the resonators' quality factor. These results open the door for the use of high kinetic inductance grAl structures in circuit quantum electrodynamics and hybrid architectures with magnetic field requirements.
Comments: Resolved typos and added data availability statement
Subjects: Superconductivity (cond-mat.supr-con); Quantum Physics (quant-ph)
Cite as: arXiv:2006.05171 [cond-mat.supr-con]
  (or arXiv:2006.05171v2 [cond-mat.supr-con] for this version)
  https://doi.org/10.48550/arXiv.2006.05171
Journal reference: Appl. Phys. Lett. 117, 120502 (2020)
Related DOI: https://doi.org/10.1063/5.0018012

Submission history

From: Kiril Borisov [view email]
[v1] Tue, 9 Jun 2020 10:36:13 UTC (4,736 KB)
[v2] Thu, 11 Jun 2020 15:23:53 UTC (4,736 KB)
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