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Changhao Yi1,2,3, Leeseok Kim1,4, Milad Marvian1,2,4

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A new randomized dynamical decoupling (DD) protocol significantly enhances quantum system performance by suppressing coherent noise. This method uses minimal additional pulses, outperforming complex deterministic DD schemes.

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Area of Science:

  • Quantum information science
  • Quantum control theory
  • Noise suppression techniques

Background:

  • Coherent noise significantly degrades quantum system performance.
  • Deterministic dynamical decoupling (DD) schemes are widely used but have limitations.
  • Optimizing DD protocols is crucial for advancing quantum technologies.

Purpose of the Study:

  • To introduce a novel randomized dynamical decoupling (DD) protocol.
  • To demonstrate substantial performance improvements over existing deterministic DD schemes.
  • To provide new analytical methods for evaluating higher-order DD protocols.

Main Methods:

  • Development of a randomized DD protocol using probabilistic pulse sequences.
  • Analytical methods for evaluating higher-order DD protocols.
  • Numerical simulations to compare randomized and deterministic DD protocols.

Main Results:

  • The randomized DD protocol effectively eliminates error terms linear in system-environment coupling.
  • A few pulses in the randomized protocol outperform deterministic protocols requiring many more.
  • The randomized protocol shows significant advantages over widely used deterministic methods, including Uhrig DD.

Conclusions:

  • Randomized DD protocols offer a superior approach to noise suppression in quantum systems.
  • The proposed protocol surpasses previously optimal deterministic DD sequences.
  • The developed analytical tools are valuable for future DD protocol research.