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@ARTICLE{Herrig:903744,
      author       = {Herrig, Tobias and Riwar, Roman},
      title        = {{C}ooper-pair transistor as a minimal topological quantum
                      circuit},
      journal      = {Physical review research},
      volume       = {4},
      number       = {1},
      issn         = {2643-1564},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {FZJ-2021-05384},
      pages        = {013038},
      year         = {2022},
      abstract     = {The outlook of protected quantum computing spurred enormous
                      progress in the search for topological materials, sustaining
                      a continued race to find the most experimentally feasible
                      platform. Here we show that one of the simplest quantum
                      circuits, the Cooper-pair transistor, exhibits a nontrivial
                      Chern number which has not yet been discussed, in spite of
                      the exhaustive existing literature. Surprisingly, the
                      resulting quantized current response is robust with respect
                      to a large number of external perturbations, most notably
                      low-frequency charge noise and quasiparticle poisoning.
                      Moreover, the fact that the higher bands experience
                      crossings with higher topological charges leads to all the
                      bands having the same Chern number, such that there is no
                      restriction to stay close to the ground state. Remaining
                      small perturbations are investigated based on a generic
                      master equation approach. Finally, we discuss a feasible
                      protocol to measure the quantized current.},
      cin          = {PGI-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-2-20110106},
      pnm          = {5222 - Exploratory Qubits (POF4-522)},
      pid          = {G:(DE-HGF)POF4-5222},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000759216100004},
      doi          = {10.1103/PhysRevResearch.4.013038},
      url          = {https://juser.fz-juelich.de/record/903744},
}