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@ARTICLE{Jiang:1048466,
      author       = {Jiang, Zhongyi and Geisert, Simon and Ihssen, Sören and
                      Pop, Ioan M. and Ansari, Mohammad H.},
      title        = {{E}nabling full localization of qubits and gates with a
                      multi-mode coupler},
      publisher    = {arXiv},
      reportid     = {FZJ-2025-04664},
      year         = {2025},
      abstract     = {Tunable couplers are a key building block of
                      superconducting quantum processors, enabling high on-off
                      ratios for two-qubit entangling interactions. While
                      crosstalk can be mitigated in idle mode, conventional
                      single-mode couplers lack independent control over
                      interactions in the one- and two-excitation manifolds,
                      leading to unitary errors such as leakage during gate
                      operations. Moreover, even at the nominal decoupled point,
                      residual wavefunction delocalization persists, causing
                      unintended qubit-qubit coupling. Here we propose a
                      multi-mode tunable coupler that enables nonlinear control of
                      interactions across excitation manifolds, achieving a high
                      on-off ratio in the one-excitation manifold while
                      suppressing coupling in the two-excitation manifold. The
                      proposed design also realizes complete localization between
                      qubits, providing perfect isolation at the decoupled point
                      and opening new possibilities for scalable, high-fidelity
                      quantum gates.},
      keywords     = {Quantum Physics (quant-ph) (Other) / Mesoscale and
                      Nanoscale Physics (cond-mat.mes-hall) (Other) / FOS:
                      Physical sciences (Other)},
      cin          = {PGI-2 / PGI-12},
      cid          = {I:(DE-Juel1)PGI-2-20110106 / I:(DE-Juel1)PGI-12-20200716},
      pnm          = {5221 - Advanced Solid-State Qubits and Qubit Systems
                      (POF4-522)},
      pid          = {G:(DE-HGF)POF4-5221},
      typ          = {PUB:(DE-HGF)25},
      doi          = {10.48550/ARXIV.2509.26211},
      url          = {https://juser.fz-juelich.de/record/1048466},
}