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Grünhaupt, Lukas [Verfasser:in]; Maleeva, Nataliya [Verfasser:in]; Skacel, Sebastian T. [Verfasser:in]; Calvo, Martino [Verfasser:in]; Levy-Bertrand, Florence [Verfasser:in]; Ustinov, Alexey V. [Verfasser:in]; Rotzinger, Hannes [Verfasser:in]; Monfardini, Alessandro [Verfasser:in]; Catelani, Gianluigi [Verfasser:in]; Pop, Ioan M. [Verfasser:in]

Loss Mechanisms and Quasiparticle Dynamics in Superconducting Microwave Resonators Made of Thin-Film Granular Aluminum

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  • Medientyp: E-Artikel
  • Titel: Loss Mechanisms and Quasiparticle Dynamics in Superconducting Microwave Resonators Made of Thin-Film Granular Aluminum
  • Beteiligte: Grünhaupt, Lukas [Verfasser:in]; Maleeva, Nataliya [Verfasser:in]; Skacel, Sebastian T. [Verfasser:in]; Calvo, Martino [Verfasser:in]; Levy-Bertrand, Florence [Verfasser:in]; Ustinov, Alexey V. [Verfasser:in]; Rotzinger, Hannes [Verfasser:in]; Monfardini, Alessandro [Verfasser:in]; Catelani, Gianluigi [Verfasser:in]; Pop, Ioan M. [Verfasser:in]
  • Erschienen: APS, 2018
  • Erschienen in: Physical review letters 121(11), 117001 (2018). doi:10.1103/PhysRevLett.121.117001
  • Sprache: Englisch
  • DOI: https://doi.org/10.1103/PhysRevLett.121.117001
  • ISSN: 0031-9007; 1079-7114; 1092-0145
  • Entstehung:
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  • Beschreibung: Superconducting high kinetic inductance elements constitute a valuable resource for quantum circuit design and millimeter-wave detection. Granular aluminum (grAl) in the superconducting regime is a particularly interesting material since it has already shown a kinetic inductance in the range of nH/□ and its deposition is compatible with conventional Al/AlOx/Al Josephson junction fabrication. We characterize microwave resonators fabricated from grAl with a room temperature resistivity of 4×103 μΩ cm, which is a factor of 3 below the superconductor to insulator transition, showing a kinetic inductance fraction close to unity. The measured internal quality factors are on the order of Qi=105 in the single photon regime, and we demonstrate that nonequilibrium quasiparticles (QPs) constitute the dominant loss mechanism. We extract QP relaxation times in the range of 1 s and we observe QP bursts every ∼20 s. The current level of coherence of grAl resonators makes them attractive for integration in quantum devices, while it also evidences the need to reduce the density of nonequilibrium QPs.
  • Zugangsstatus: Freier Zugang