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@ARTICLE{Richer:824043,
      author       = {Richer, Susanne and DiVincenzo, David},
      title        = {{C}ircuit design implementing longitudinal coupling: {A}
                      scalable scheme for superconducting qubits},
      journal      = {Physical review / B},
      volume       = {93},
      number       = {13},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2016-06667},
      pages        = {134501},
      year         = {2016},
      abstract     = {We present a circuit construction for a fixed-frequency
                      superconducting qubit and show how it can be scaled up to a
                      grid with strictly local interactions. The circuit QED
                      realization we propose implements σz type coupling between
                      a superconducting qubit and any number of LC resonators. The
                      resulting longitudinal coupling is inherently different from
                      the usual σx type transverse coupling, which is the one
                      that has been most commonly used for superconducting qubits.
                      In a grid of fixed-frequency qubits and resonators with a
                      particular pattern of always-on interactions, coupling is
                      strictly confined to nearest and next-nearest neighbor
                      resonators; there is never any direct qubit-qubit coupling.
                      We note that just a single unique qubit frequency suffices
                      for the scalability of this scheme. The same is true for the
                      resonators, if the resonator-resonator coupling constants
                      are varied instead. A controlled phase gate between two
                      neighboring qubits can be realized with microwave drives on
                      the qubits, without affecting the other qubits. This fact is
                      a significant advantage for the scalability of this scheme},
      cin          = {IAS-3 / PGI-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-3-20090406 / 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:000373311300005},
      doi          = {10.1103/PhysRevB.93.134501},
      url          = {https://juser.fz-juelich.de/record/824043},
}