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@ARTICLE{Frees:858891,
      author       = {Frees, Adam and Mehl, Sebastian and Gamble, John King and
                      Friesen, Mark and Coppersmith, S. N.},
      title        = {{A}diabatic two-qubit gates in capacitively coupled quantum
                      dot hybrid qubits},
      journal      = {npj Quantum information},
      volume       = {5},
      number       = {1},
      issn         = {2056-6387},
      address      = {London},
      publisher    = {Nature Publ. Group},
      reportid     = {FZJ-2018-07727},
      pages        = {73},
      year         = {2019},
      abstract     = {The ability to tune qubits to flat points in their energy
                      dispersions (“sweet spots”) is an important tool for
                      mitigating the effects of charge noise and dephasing in
                      solid-state devices. However, the number of derivatives that
                      must be simultaneously set to zero grows exponentially with
                      the number of coupled qubits, making the task untenable for
                      as few as two qubits. This is a particular problem for
                      adiabatic gates, due to their slower speeds. Here, we
                      propose an adiabatic two-qubit gate for quantum dot hybrid
                      qubits, based on the tunable, electrostatic coupling between
                      distinct charge configurations. We confirm the absence of a
                      conventional sweet spot, but show that controlled-Z (CZ)
                      gates can nonetheless be optimized to have fidelities of
                      $~99\%$ for a typical level of quasistatic charge noise
                      (σε ≃ 1 μeV). We then develop the concept of a
                      dynamical sweet spot (DSS), for which the time-averaged
                      energy derivatives are set to zero, and identify a simple
                      pulse sequence that achieves an approximate DSS for a CZ
                      gate, with a 5× improvement in the fidelity. We observe
                      that the results depend on the number of tunable parameters
                      in the pulse sequence, and speculate that a more elaborate
                      sequence could potentially attain a true DSS.},
      cin          = {PGI-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-2-20110106},
      pnm          = {144 - Controlling Collective States (POF3-144)},
      pid          = {G:(DE-HGF)POF3-144},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000483983200001},
      doi          = {10.1038/s41534-019-0190-7},
      url          = {https://juser.fz-juelich.de/record/858891},
}