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Implementation of Conditional Phase Gates Based on Tunable ZZ Interactions.

Michele C Collodo1, Johannes Herrmann1, Nathan Lacroix1

  • 1Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland.

Physical Review Letters
|January 7, 2021
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Summary
This summary is machine-generated.

We demonstrate a new method for high-fidelity two-qubit gates in superconducting circuits using a tunable ZZ interaction. This approach enables rapid, low-leakage gates crucial for quantum information processing.

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Area of Science:

  • Quantum computing
  • Superconducting circuits
  • Quantum information processing

Background:

  • High-fidelity two-qubit gates are critical for gate-based quantum computing.
  • Existing methods often rely on specific resonant interactions or frequency tunability.

Purpose of the Study:

  • To present an alternative approach for high-fidelity two-qubit gates using a tunable ZZ interaction.
  • To demonstrate a rapid, low-leakage conditional phase (CZ) gate with high fidelity.

Main Methods:

  • Utilized a flux-tunable coupler to realize a tunable cross-Kerr-type ZZ interaction between two superconducting qubits.
  • Controlled the ZZ-coupling rate over three orders of magnitude.
  • Performed interleaved randomized benchmarking to measure gate fidelity and leakage.

Main Results:

  • Achieved a rapid (38 ns) conditional phase (CZ) gate with high contrast and low leakage (0.14±0.24%).
  • Demonstrated a high gate fidelity of 97.9±0.7% without relying on resonant interactions.
  • Showcased the ability to access the entire conditional phase gate family by adjusting a single control parameter.

Conclusions:

  • The tunable ZZ interaction provides an effective method for implementing high-fidelity two-qubit gates in superconducting circuits.
  • This approach offers advantages in speed, fidelity, and control flexibility for quantum information processing.
  • The demonstrated technique simplifies the control of conditional phase gates, paving the way for more complex quantum operations.