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@ARTICLE{Xu:943469,
      author       = {Xu, Xuexin and Ansari, M.},
      title        = {{A}n error-protected cross-resonance switch in
                      weakly-tuneable architectures},
      publisher    = {arXiv},
      reportid     = {FZJ-2023-01038},
      year         = {2022},
      abstract     = {In two-qubit gates activated by microwave pulses, by
                      turning pulse on or off, the state of qubits are swapped
                      between entangled or idle modes. In either mode, the
                      presence of stray couplings makes qubits accumulate coherent
                      phase error. However, the error rates in the two modes
                      differ because qubits carry different stray coupling
                      strengths in each mode; therefore, eliminating stray
                      coupling from one mode does not remove it from the other. We
                      propose to combine such a gate with a tunable coupler and
                      show that both idle and entangled qubits can become free
                      from stray couplings. This significantly increases the
                      operational switch fidelity in quantum algorithms. We
                      further propose a weakly-tunable qubit as an optimum coupler
                      to bring the two modes parametrically near each other. This
                      remarkably enhances the tuning process by reducing its
                      leakage.},
      keywords     = {Quantum Physics (quant-ph) (Other) / FOS: Physical sciences
                      (Other)},
      cin          = {PGI-2},
      cid          = {I:(DE-Juel1)PGI-2-20110106},
      pnm          = {5224 - Quantum Networking (POF4-522)},
      pid          = {G:(DE-HGF)POF4-5224},
      typ          = {PUB:(DE-HGF)25},
      doi          = {10.48550/ARXIV.2212.05519},
      url          = {https://juser.fz-juelich.de/record/943469},
}