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Scalable Method for Eliminating Residual ZZ Interaction between Superconducting Qubits.

Zhongchu Ni1,2,3,4, Sai Li1,2,4, Libo Zhang1,2,4

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Researchers developed a method to cancel unwanted ZZ interaction in superconducting qubits. This technique uses microwave drives to improve quantum operation quality and is crucial for scalable quantum computing.

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Area of Science:

  • Quantum Computing
  • Superconducting Qubits
  • Quantum Information Processing

Background:

  • Unwanted ZZ interaction is a quantum-mechanical crosstalk phenomenon in superconducting qubits.
  • This interaction adversely affects quantum operation quality and hinders scalable quantum information processing.

Purpose of the Study:

  • To propose and experimentally demonstrate a practical approach for complete cancellation of residual ZZ interaction.
  • To enhance the quality of quantum operations in fixed-frequency transmon qubits.

Main Methods:

  • Applying a weak microwave drive to the intermediate coupler connecting qubits.
  • Inducing an AC Stark shift for ZZ cancellation at a specific frequency.
  • Verifying cancellation via measurements of two-qubit entangling phases and ZZ correlations.

Main Results:

  • Complete cancellation of residual ZZ interaction was experimentally demonstrated.
  • Vanishing two-qubit entangling phases and ZZ correlations confirmed cancellation effectiveness.
  • Randomized benchmarking showed good idling gate fidelity, aligning with coherence limits.

Conclusions:

  • The proposed method effectively cancels ZZ interaction in fixed-frequency transmon qubits.
  • The technique is extensible, allows independent qubit-coupler addressability, and is compatible with tunable and nontunable couplers.
  • This approach promises improved compatibility with future large-scale quantum processors.