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Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting

M A Rol1,2, F Battistel1, F K Malinowski1,2

  • 1QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands.

Physical Review Letters
|October 22, 2019
PubMed
Summary
This summary is machine-generated.

We developed a fast 40 nanosecond conditional-phase (cz) gate for transmon qubits. This gate achieves high fidelity (99.1%) and low leakage (0.1%) using a novel bipolar flux pulse, improving quantum computing performance.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Conditional-phase (CZ) gates are essential for quantum computation.
  • Transmon qubits are a leading platform for superconducting quantum computers.
  • Achieving fast and high-fidelity gates is crucial for scalable quantum computing.

Purpose of the Study:

  • To present a novel 40 nanosecond CZ gate for transmon qubits.
  • To demonstrate high fidelity and suppressed leakage using a specific pulse sequence.
  • To investigate the factors limiting gate performance.

Main Methods:

  • Implementation of a bipolar flux pulse to control transmon qubit interactions.
  • Utilizing destructive interference within the pulse to suppress leakage errors.
  • Employing a built-in echo mechanism to enhance gate fidelity.
  • Conducting numerical simulations to validate experimental results.

Main Results:

  • A 40 nanosecond CZ gate was experimentally realized.
  • Achieved gate fidelity of 99.1% with leakage suppressed to 0.1%.
  • The pulse demonstrated robustness against long-timescale flux control distortions.
  • Simulations identified high-frequency dephasing and short-timescale distortions as key limitations.

Conclusions:

  • The developed CZ gate approaches the speed limit imposed by exchange coupling.
  • The pulse design effectively suppresses leakage and enhances fidelity.
  • The findings provide insights into optimizing gate operations in transmon qubits.
  • This work contributes to the development of more powerful superconducting quantum computers.