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High-Fidelity Software-Defined Quantum Logic on a Superconducting Qudit.

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|November 6, 2020
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Summary
This summary is machine-generated.

We developed an efficient method for precise quantum system control using optimal control techniques. This approach successfully demonstrated a high-fidelity 0↔2 SWAP gate, achieving 99.4% average fidelity.

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Area of Science:

  • Quantum Information Science
  • Quantum Control Engineering

Background:

  • Achieving high-fidelity control over multilevel quantum systems is crucial for quantum computing.
  • Existing methods may lack generality or efficiency for complex quantum operations.

Purpose of the Study:

  • To present an efficient and generalizable approach for arbitrary, high-fidelity control of multilevel quantum systems.
  • To demonstrate the effectiveness of optimal control techniques in quantum gate implementation.

Main Methods:

  • Utilized optimal control techniques to design and implement quantum gate operations.
  • Developed a continuous, software-defined microwave pulse for system manipulation.
  • Extracted the system Hamiltonian and calibrated the quantum and classical hardware chain.
  • Evaluated gate fidelity using established quantum measurement protocols.

Main Results:

  • Successfully implemented a 0↔2 SWAP gate with an average gate fidelity of 99.4%.
  • Demonstrated precise control over a multilevel quantum system.
  • The developed method proved efficient and robust.

Conclusions:

  • Optimal control techniques offer a powerful and generalizable route to achieving universal quantum control.
  • The presented approach provides an efficient alternative for high-fidelity quantum gate operations.
  • This work advances the practical implementation of complex quantum operations.