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Diabatic Gates for Frequency-Tunable Superconducting Qubits.

R Barends1, C M Quintana1, A G Petukhov2

  • 1Google, Santa Barbara, California 93117, USA.

Physical Review Letters
|December 7, 2019
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Summary
This summary is machine-generated.

We achieved fast and accurate two-qubit gates using superconducting qubits by synchronizing parameters to minimize errors. This breakthrough enhances quantum computing performance and can be applied to more complex operations.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Achieving high-fidelity and fast two-qubit gates is crucial for scalable quantum computation.
  • Superconducting qubits are a leading platform for building quantum processors.
  • Minimizing errors, particularly leakage errors, is a key challenge in gate design.

Purpose of the Study:

  • To demonstrate high-fidelity, fast diabatic two-qubit gates using frequency-tunable superconducting qubits.
  • To introduce a synchronization technique for entangling parameters to minimize leakage errors.
  • To validate the effectiveness of this approach for both iSWAP-like and CPhase gates.

Main Methods:

  • Utilized frequency-tunable superconducting qubits.
  • Implemented a synchronization strategy between entangling parameters and leakage channel minima.
  • Employed cross-entropy benchmarking to assess gate fidelity.
  • Explored iSWAP-like and CPhase gate implementations.

Main Results:

  • Achieved diabatic two-qubit gates with Pauli error rates as low as 4.3(2)×10⁻³.
  • Demonstrated gate operation times as fast as 18 nanoseconds.
  • Observed agreement between experimental gate parameter landscapes and theoretical model predictions.
  • Confirmed robust tune-up facilitated by the synchronization method.

Conclusions:

  • The demonstrated synchronization technique enables high-fidelity, fast two-qubit gates in superconducting qubits.
  • This method effectively suppresses leakage errors, leading to improved gate performance.
  • The approach is versatile and shows potential for extension to multibody quantum operations.