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@ARTICLE{Lange:1050560,
      author       = {Lange, F. and Heunisch, L. and Fehske, H. and DiVincenzo,
                      D. P. and Hartmann, M. J.},
      title        = {{C}ross-talk in superconducting qubit lattices with tunable
                      couplers -- comparing transmon and fluxonium architectures},
      publisher    = {arXiv},
      reportid     = {FZJ-2026-00317},
      year         = {2025},
      abstract     = {Cross-talk between qubits is one of the main challenges for
                      scaling superconducting quantum processors. Here, we use the
                      density-matrix renormalization-group to numerically analyze
                      lattices of superconducting qubits from a perspective of
                      many-body localization. Specifically, we compare different
                      architectures that include tunable couplers designed to
                      decouple qubits in the idle state, and calculate the
                      residual ZZ interactions as well as the inverse
                      participation ratio in the computational basis states. For
                      transmon qubits outside of the straddling regime, the
                      results confirm that tunable C-shunt flux couplers are
                      significantly more efficient in mitigating the ZZ
                      interactions than tunable transmons. A recently proposed
                      fluxonium architecture with tunable transmon couplers is
                      demonstrated to also maintain its strong suppression of the
                      ZZ interactions in larger systems, while having a higher
                      inverse participation ratio in the computational basis
                      states than lattices of transmon qubits. Our results thus
                      suggest that fluxonium architectures may feature lower cross
                      talk than transmon lattices when designed to achieve similar
                      gate speeds and fidelities.},
      keywords     = {Quantum Physics (quant-ph) (Other) / FOS: Physical sciences
                      (Other)},
      cin          = {PGI-2},
      cid          = {I:(DE-Juel1)PGI-2-20110106},
      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.2504.10298},
      url          = {https://juser.fz-juelich.de/record/1050560},
}