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@INPROCEEDINGS{Xu:916715,
      author       = {Xu, Xuexin and Ansari, Mohammad},
      title        = {{M}itigating parasitic interactions in superconducting
                      circuits},
      reportid     = {FZJ-2023-00055},
      year         = {2021},
      abstract     = {Implementation of high-performance two-qubit gates is a key
                      factor for scalable quantum computation. However, the
                      state-of-the-art superconducting two-qubit gates are yet far
                      from being perfect due to the parasitic ZZ coupling. In this
                      poster, we introduce a general theory to evaluate the
                      “static” ZZ interaction between seemingly idle qubits
                      [1] as well as the “dynamical” ZZ interaction between
                      driving entangled qubits, and find the characteristics of
                      both static and dynamical ZZ freedoms [2]. Moreover, we
                      demonstrate the two freedoms can be realized in one circuit
                      with a tunable coupler so as to eliminate ZZ interaction
                      throughout gate operations [3]. Our theory shows that using
                      these methods the fidelity of a CR gate is able to achieve
                      the coherence limit.References[1] J. Ku, X. Xu, M. Brink, D.
                      C. McKay, J. B. Hertzberg, M. H. Ansari, B. L. T Plourde,
                      Suppression of unwanted ZZ interactions in a hybrid
                      two-qubit system. Physical Review Letters 125, 200504
                      (2020)[2] X. Xu and M. H. Ansari, ZZ freedom in two-qubit
                      gates. Physical Review Applied 15, 064074 (2021)[3] X. Xu
                      and M. H. Ansari, Parasitic free gates. In preparation},
      month         = {Dec},
      date          = {2021-12-13},
      organization  = {WE-Heraeus-Seminar / Hybrid Solid
                       State Quantum Circuits, Sensors, and
                       Metrology, Online-Seminar (Germany), 13
                       Dec 2021 - 16 Dec 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/916715},
}