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Taming Rydberg Decay with Measurement-Based Quantum Computation.

Cheng-Cheng Yu1,2,3, Zi-Han Chen1,2,3, Yu-Hao Deng1,2,3

  • 1University of Science and Technology of China, Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, Hefei 230026, China.

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Summary
This summary is machine-generated.

This study introduces a new method using measurement-based quantum computation to fix errors in neutral atom quantum computers caused by Rydberg decay. The approach effectively locates errors without complex midcircuit detection, improving quantum error correction.

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Area of Science:

  • Quantum Computing
  • Atomic Physics
  • Quantum Error Correction

Background:

  • Neutral atom arrays are promising for fault-tolerant quantum computing.
  • Qubit leakage and loss, particularly Rydberg decay during two-qubit gates, are major error sources.
  • Propagated leakage errors degrade quantum error correction code performance.

Purpose of the Study:

  • To present a novel method for mitigating Rydberg decay errors in neutral atom quantum computers.
  • To leverage measurement-based quantum computation and topological cluster states for error localization.
  • To avoid complex midcircuit leakage detection for broader applicability.

Main Methods:

  • Utilized measurement-based quantum computation with topological cluster states.
  • Employed final leakage detection to identify propagated errors from Rydberg decay.
  • Focused on the Rb atom platform for demonstration.

Main Results:

  • Achieved a high error threshold of 3.65% per CZ gate for pure Rydberg decay.
  • Demonstrated a favorable effective error distance (d_e ≈ d).
  • Showed comparable or marginally better subthreshold performance than state-of-the-art erasure conversion protocols with reduced experimental overhead.

Conclusions:

  • The proposed method effectively addresses Rydberg decay errors using measurement-based quantum computation.
  • The scheme offers broader applicability by eliminating the need for atom-species-specific midcircuit leakage detection.
  • This approach provides a promising strategy for enhancing fault tolerance in neutral atom quantum computers.