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@INPROCEEDINGS{Xu:916714,
      author       = {Xu, Xuexin and Ansari, Mohammad},
      title        = {{ZZ} freedom in two qubit gates},
      reportid     = {FZJ-2023-00054},
      year         = {2021},
      abstract     = {Achieving high fidelity two qubit gates requires
                      elimination of unwanted interactions among qubits. Weakly
                      anharmonic superconducting qubits in the absence of external
                      driving exhibit an always-on phase error mainly due to a
                      sub-MHz repulsion between computational and
                      non-computational energy levels, the so-called static ZZ
                      interaction. Here we present that in general there are two
                      theoretical ways for eliminating fundamental ZZ error: 1)
                      static ZZ freedom by combining qubits with opposite sign
                      anharmonicity 2) dynamic ZZ freedom in driven qubits with a
                      microwave pulse, which can be universally realized by
                      combining qubits with any anharmonicity signs. Scaling up
                      the number of such qubits can mitigate high fidelity gate
                      operation.Reference1. Xuexin, Xu, and M. H. Ansari. "ZZ
                      freedom in two qubit gates." arXiv:2009.00485 (2020).2. Ku,
                      Jaseung, et al. "Suppression of Unwanted ZZ Interactions in
                      a Hybrid Two-Qubit System." arXiv:2003.02775 (2020)},
      month         = {Mar},
      date          = {2021-03-15},
      organization  = {APS March Meeting 2021, online (USA),
                       15 Mar 2021 - 21 Mar 2021},
      subtyp        = {Invited},
      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)6},
      url          = {https://juser.fz-juelich.de/record/916714},
}