4.6 Article

Control and mitigation of microwave crosstalk effect with superconducting qubits

Journal

APPLIED PHYSICS LETTERS
Volume 121, Issue 15, Pages -

Publisher

AIP Publishing
DOI: 10.1063/5.0115393

Keywords

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Funding

  1. Beijing Natural Science Foundation [Z190012]
  2. National Natural Science Foundation of China [11890704, 12004042, 12104055, 12104056, 12004206]
  3. Key-Area Research and Development Program of Guang Dong Province [2018B030326001]

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This article proposes an error mitigation scheme to address the microwave crosstalk issue in single-qubit gates of superconducting quantum processors. By controlling detuning, decomposing gates, and optimizing parameters, the error can be constrained and gate fidelity can be improved.
Improving gate performance is vital for scalable quantum computing. Universal quantum computing also requires gate fidelity to reach a high level. For a superconducting quantum processor, which operates in the microwave band, the single-qubit gates are usually realized with microwave driving. The crosstalk between microwave pulses is a non-negligible error source. In this article, we propose an error mitigation scheme to address this crosstalk issue for single-qubit gates. There are three steps in our method. First, by controlling the detuning between qubits, the microwave induced classical crosstalk error can be constrained within the computational subspace. Second, by applying the general decomposition procedure, the arbitrary single-qubit gate can be decomposed as a sequence of root X and virtual Z gates. Finally, by optimizing the parameters in virtual Z gates, the error constrained in the computational space can be corrected. Using our method, no additional compensation signals are needed, arbitrary single-qubit gate time will not be prolonged, and the circuit depth containing simultaneous single-qubit gates will also not increase. The simulation results show that, in a specific regime of qubit-qubit detuning, the infidelities of simultaneous single-qubit gates can be as low as that without microwave crosstalk.

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