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@ARTICLE{Viola:280119,
      author       = {Viola, Giovanni and Catelani, Gianluigi},
      title        = {{C}ollective modes in the fluxonium qubit},
      journal      = {Physical review / B},
      volume       = {92},
      number       = {22},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-07865},
      pages        = {224511},
      year         = {2015},
      abstract     = {Superconducting qubit designs vary in complexity from
                      single- and few-junction systems, such as the transmon and
                      flux qubits, to the many-junction fluxonium. Here, we
                      consider the question of whether the many degrees of freedom
                      in the fluxonium circuit can limit the qubit coherence time.
                      Such a limitation is in principle possible, due to the
                      interactions between the low-energy, highly anharmonic qubit
                      mode and the higher-energy, weakly anharmonic collective
                      modes. We show that so long as the coupling of the
                      collective modes with the external electromagnetic
                      environment is sufficiently weaker than the
                      qubit-environment coupling, the qubit dephasing induced by
                      the collective modes does not significantly contribute to
                      decoherence. Therefore, the increased complexity of the
                      fluxonium qubit does not constitute by itself a major
                      obstacle for its use in quantum computation architectures.},
      cin          = {PGI-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-2-20110106},
      pnm          = {144 - Controlling Collective States (POF3-144)},
      pid          = {G:(DE-HGF)POF3-144},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000367060600005},
      doi          = {10.1103/PhysRevB.92.224511},
      url          = {https://juser.fz-juelich.de/record/280119},
}