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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Universally Robust Quantum Control.

Pablo M Poggi1,2, Gabriele De Chiara3, Steve Campbell4,5,6

  • 1Department of Physics, SUPA and University of Strathclyde, Glasgow G4 0NG, United Kingdom.

Physical Review Letters
|May 28, 2024
PubMed
Summary
This summary is machine-generated.

We developed a method to create robust quantum gates resistant to unknown errors. This approach uses optimal control to mimic specific mathematical properties, enhancing quantum computation reliability.

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Area of Science:

  • Quantum Information Science
  • Quantum Control Theory
  • Error Mitigation in Quantum Systems

Background:

  • Quantum systems are sensitive to parameter variations in their Hamiltonian.
  • Fidelity susceptibility quantifies leading-order errors but is challenging to control directly.
  • Developing error-resistant quantum operations is crucial for scalable quantum computing.

Purpose of the Study:

  • To investigate the robustness of quantum system evolution against uncontrolled parameter variations.
  • To derive novel control pulses for mitigating systematic unknown errors.
  • To enhance the reliability of single- and two-qubit gates.

Main Methods:

  • Expressing fidelity susceptibility in superoperator form.
  • Developing an optimal control protocol based on superoperator representation.
  • Designing control pulses equivalent to 1-designs of the Haar distribution.

Main Results:

  • A method to derive control pulses robust to systematic unknown errors.
  • Demonstration of the fidelity susceptibility's superoperator form.
  • The proposed protocol is shown to be equivalent to a 1-design.

Conclusions:

  • The derived optimal control protocol significantly enhances error resistance in quantum gates.
  • This method provides a powerful tool for building fault-tolerant quantum computers.
  • The findings are directly applicable to improving single- and two-qubit gate performance.