Cross-resonance interactions between superconducting qubits with variable detuning

  1. Matthew Ware,
  2. Blake R. Johnson,
  3. Jay M. Gambetta,
  4. Thomas A. Ohki,
  5. Jerry M. Chow,
  6. and B. L. T. Plourde
Cross-resonance interactions are a promising way to implement all-microwave two-qubit gates with fixed-frequency qubits. In this work, we study the dependence of the cross-resonance interaction rate on qubit-qubit detuning and compare with a model that includes the higher levels of a transmon system. To carry out this study we employ two transmon qubits–one fixed frequency and the other flux tunable–to allow us to vary the detuning between qubits. We find that the interaction closely follows a three-level model of the transmon, thus confirming the presence of an optimal regime for cross-resonance gates.
arxiv pdf

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