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@ARTICLE{Grnhaupt:851772,
      author       = {Grünhaupt, Lukas and Maleeva, Nataliya and Skacel,
                      Sebastian T. and Calvo, Martino and Levy-Bertrand, Florence
                      and Ustinov, Alexey V. and Rotzinger, Hannes and Monfardini,
                      Alessandro and Catelani, Gianluigi and Pop, Ioan M.},
      title        = {{L}oss {M}echanisms and {Q}uasiparticle {D}ynamics in
                      {S}uperconducting {M}icrowave {R}esonators {M}ade of
                      {T}hin-{F}ilm {G}ranular {A}luminum},
      journal      = {Physical review letters},
      volume       = {121},
      number       = {11},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2018-05287},
      pages        = {117001},
      year         = {2018},
      abstract     = {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.},
      cin          = {PGI-11},
      ddc          = {550},
      cid          = {I:(DE-Juel1)PGI-11-20170113},
      pnm          = {144 - Controlling Collective States (POF3-144)},
      pid          = {G:(DE-HGF)POF3-144},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:30265102},
      UT           = {WOS:000444586600016},
      doi          = {10.1103/PhysRevLett.121.117001},
      url          = {https://juser.fz-juelich.de/record/851772},
}