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@ARTICLE{Xu:902777,
      author       = {Xu, Xuexin and Ansari, Mohammad},
      title        = {{Z} {Z} {F}reedom in {T}wo-{Q}ubit {G}ates},
      journal      = {Physical review applied},
      volume       = {15},
      number       = {6},
      issn         = {2331-7019},
      address      = {College Park, Md. [u.a.]},
      publisher    = {American Physical Society},
      reportid     = {FZJ-2021-04548},
      pages        = {064074},
      year         = {2021},
      abstract     = {Superconducting qubits on a circuit exhibit an always-on
                      state-dependent phase error. This error is due to sub-MHz
                      parasitic interaction that repels computational levels from
                      noncomputational ones. We study a general theory to evaluate
                      the “static” repulsion between seemingly idle qubits as
                      well as the “dynamical” repulsion between entangled
                      qubits under microwave driving gate. By combining qubits of
                      either the same or opposite anharmonicity signs we find the
                      characteristics of static and dynamical ZZ freedoms. The
                      latter universally eliminate the parasitic repulsion,
                      leading us to mitigate high-fidelity gate operation. Our
                      theory introduces the opportunities for making perfect
                      entangled and unentangled states, which is extremely useful
                      for quantum technology.},
      cin          = {PGI-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-2-20110106},
      pnm          = {5224 - Quantum Networking (POF4-522)},
      pid          = {G:(DE-HGF)POF4-5224},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000670307200001},
      doi          = {10.1103/PhysRevApplied.15.064074},
      url          = {https://juser.fz-juelich.de/record/902777},
}