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@ARTICLE{Riwar:850022,
      author       = {Riwar, Roman and Glazman, L. I. and Catelani, G.},
      title        = {{D}issipation by normal-metal traps in transmon qubits},
      journal      = {Physical review / B},
      volume       = {98},
      number       = {2},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2018-04108},
      pages        = {024502},
      year         = {2018},
      abstract     = {Quasiparticles are an intrinsic source of relaxation and
                      decoherence for superconducting qubits. Recent works have
                      shown that normal-metal traps may be used to evacuate
                      quasiparticles, and potentially improve the qubit lifetime.
                      Here, we investigate how far the normal metals themselves
                      may introduce qubit relaxation. We identify the Ohmic losses
                      inside the normal metal and the tunneling current through
                      the normal-metal–superconductor interface as the relevant
                      relaxation mechanisms. We show that the Ohmic loss
                      contribution depends strongly on the device and trap
                      geometry, as a result of the inhomogeneous electric fields
                      in the qubit. The correction of the quality factor due to
                      the tunneling current on the other hand is highly sensitive
                      to the nonequilibrium distribution function of the
                      quasiparticles. Overall, we show that even when choosing
                      less than optimal parameters, the presence of normal-metal
                      traps does not affect the quality factor of state-of-the-art
                      qubits.},
      cin          = {PGI-11 / PGI-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-11-20170113 / 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:000437668600006},
      doi          = {10.1103/PhysRevB.98.024502},
      url          = {https://juser.fz-juelich.de/record/850022},
}