High-Contrast ZZ Interaction Using Superconducting Qubits with Opposite-Sign Anharmonicity.

  title={High-Contrast ZZ Interaction Using Superconducting Qubits with Opposite-Sign Anharmonicity.},
  author={Peng Zhao and P. Xu and D. Lan and Ji Chu and X. Tan and Haifeng Yu and Yang Yu},
  journal={Physical review letters},
  volume={125 20},
For building a scalable quantum processor with superconducting qubits, ZZ interaction is of great concern because its residual has a crucial impact to two-qubit gate fidelity. Two-qubit gates with fidelity meeting the criterion of fault-tolerant quantum computation have been demonstrated using ZZ interaction. However, as the performance of quantum processors improves, the residual static ZZ can become a performance-limiting factor for quantum gate operation and quantum error correction. Here… Expand
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