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@ARTICLE{Xu:1034214,
      author       = {Xu, Xuexin and Manabputra and Vignes, Chloé and Ansari,
                      Mohammad H. and Martinis, John M.},
      title        = {{L}attice {H}amiltonians and stray interactions within
                      quantum processors},
      journal      = {Physical review applied},
      volume       = {22},
      number       = {6},
      issn         = {2331-7019},
      address      = {College Park, Md. [u.a.]},
      publisher    = {American Physical Society},
      reportid     = {FZJ-2024-07003},
      pages        = {064030},
      year         = {2024},
      abstract     = {Developing Hamiltonian models for quantum processors with
                      many qubits on the same chip is crucial for advancing
                      quantum computing technologies. Stray couplings between
                      qubits lead to errors in gate operations. This study
                      underscores the importance of incorporating lattice
                      Hamiltonians into quantum circuit design. By comparing
                      many-body effects with two-body stray couplings, we show how
                      adjusting circuit parameters can increase two-qubit-gate
                      fidelity. We find that loosely decoupled qubits result in
                      weaker stray interactions and higher gate fidelity,
                      challenging conventional assumptions. We investigate the
                      scenario where three-body 𝑍⁢𝑍⁢𝑍 interaction
                      surpasses two-body 𝑍⁢𝑍 interactions, highlighting
                      the transformative potential of lattice Hamiltonians for
                      novel multiqubit gates. Moreover, we investigate the
                      cross-resonance gate within the lattice-Hamiltonian
                      framework and examine the impact of microwave pulses on
                      stray coupling. This emphasizes the necessity of developing
                      a comprehensive theoretical framework that includes lattice
                      interactions, which are now critical given the
                      sophistication of contemporary quantum hardware. These
                      insights are vital for developing fault-tolerant quantum
                      computing and next-generation quantum processors.},
      cin          = {PGI-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-2-20110106},
      pnm          = {5223 - Quantum-Computer Control Systems and Cryoelectronics
                      (POF4-522) / 5221 - Advanced Solid-State Qubits and Qubit
                      Systems (POF4-522) / 5214 - Quantum State Preparation and
                      Control (POF4-521) / Verbundprojekt: German Quantum Computer
                      based on Superconducting Qubits (GEQCOS) - Teilvorhaben:
                      Charakterisierung, Kontrolle und Auslese (13N15685) /
                      OpenSuperQPlus - Open Superconducting Quantum Computers
                      (101113946)},
      pid          = {G:(DE-HGF)POF4-5223 / G:(DE-HGF)POF4-5221 /
                      G:(DE-HGF)POF4-5214 / G:(BMBF)13N15685 /
                      G:(EU-Grant)101113946},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001380284900006},
      doi          = {10.1103/PhysRevApplied.22.064030},
      url          = {https://juser.fz-juelich.de/record/1034214},
}