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Error mitigation is essential for quantum computing. This study introduces a simple technique using global depolarizing error channels to infer error-free results from noisy quantum device data, enabling new insights in quantum many-body physics.

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Area of Science:

  • Quantum Computing
  • Quantum Many-Body Physics

Background:

  • Quantum devices are prone to noise, limiting the accuracy of results.
  • Error mitigation is crucial for obtaining reliable outcomes from current quantum hardware.

Purpose of the Study:

  • To present a simple yet effective error mitigation technique for deep quantum circuits.
  • To demonstrate the technique's ability to extract previously inaccessible quantitative results.

Main Methods:

  • Assumption of noise described by global depolarizing error channels.
  • Direct measurement of errors on the quantum device.
  • Utilizing an error model ansatz to infer error-free data.

Main Results:

  • Successful application to entanglement measurements and real-time dynamics of confinement in quantum spin chains.
  • Extraction of meson masses from IBM quantum computers, indicating confinement signatures.
  • Demonstrated applicability in numerical simulations with realistic error models.

Conclusions:

  • The proposed error mitigation protocol is device-independent and easily implementable.
  • Significant improvements in results are achieved when global errors align with depolarization.
  • Enables quantitative analysis of complex quantum systems on current quantum hardware.